Database Users

Universal suddenly shuts down; battery or other problem?

I recently acquired a HTC Universal for dirt cheap, and have found the first problem to explain the low price: Whenever I'm using a "power-hungry" application (TCPMP, Internet via Wi-Fi) it eventually just blacks out. Full shutdown without warning.
When trying to reactivate the unit, it reboots as if after a soft reset.
In fact, if I try to reactivate it too quickly, even the reboot fails.
None of the above happens when on external power.
This leads me to think that it's nothing worse than a battery that's lost its mojo, but since there is no warning about low battery, and when the reboot finishes successfully even SPB says the battery is somewhere around 70%, I want to run this by you guys.
What do you think? Just go get a new battery, or is there something else going on which will make buying a new battery just a waste of money?

I'd say it's the battery, 99% sure.
I'ts gotten old and its voltage breaks down under load. If you have proper equipment and a glimpse of an idea what you're doing you should drain about 300mA from the battery and measure its output voltage.
You'll most likely see it going below 3.0V quickly.

I'm afraid I don't have that equipment, but all I really needed to hear was that it's probably the battery.
Now I can stop thinking about it and just order a new batery.

Unexpected reboot - Apparently bettery issue
Hey Holybear, my device shows exactly same symptom, If possible let us know if bat replacement solved the issue>

Holy Bear said:
I recently acquired a HTC Universal for dirt cheap, and have found the first problem to explain the low price: Whenever I'm using a "power-hungry" application (TCPMP, Internet via Wi-Fi) it eventually just blacks out. Full shutdown without warning.
When trying to reactivate the unit, it reboots as if after a soft reset.
In fact, if I try to reactivate it too quickly, even the reboot fails.
None of the above happens when on external power.
This leads me to think that it's nothing worse than a battery that's lost its mojo, but since there is no warning about low battery, and when the reboot finishes successfully even SPB says the battery is somewhere around 70%, I want to run this by you guys.
What do you think? Just go get a new battery, or is there something else going on which will make buying a new battery just a waste of money?
Click to expand...
Click to collapse
I knew I wasn't the only one withthat problem. I think i've prooved it to be a battery faultt. as if you taake te battery out after it gets to that stage where you just can not get it too complete a boot up without it shuttinng down again
take out battery ,place finer oveer all battery trmminals and plug inn your mainss charger it should now boot up and runn fin off the charger unless your finger slips off the battery terminals. thisshsowws it's the temprature sensor in the battery.
I posted a more in depth reply to a guy in the wm6 threads as wifi heeaating up battery wass shutting off his device as well

@ cyberjak
Hmm, the idea that a temperature sensor in the battery causes this problems is interesting. I'd just expect the device not being cappable of rebooting instantly, because there should be a hysteresis implemented in the battery's protection circuit.
I had the exact same problems and described them elsewhere, but in my case it surely wasn't an issue of temperature.
I'd suggest to take out the battery and wait about an hour for the device and the battery to cool off. Most likely the battery will then take a complete boot but shut down soon after that - without having gotten near to "warm" yet.
If this happens you can be sure that the battery itself is dead without needing to measure anything.

Okay, to tell you what I tried:
I ran the Universal until it spontaneously went dead.
Started bootlaoder to see how much longer it would work on that. Was a bit longer, what with low energy consumption, but soon even that wouldn't stay on for long.
Then decided to try the "old wives' tale" (meaning I don't know whether there's any sense behind it or not) of putting the battery in the freezer for a little while.
When I took it out and let it get back to normal temp, I plugged it in and after a while booted the Universal. It showed 40% battery, lower than it had ever gotten lately.
Recharged for a full day.
Tried TCPMP: went dead after three minutes.
So in my experience the above didn't help battery performance.
Am going to get a new battery in a few days; I'll keep you posted on progress as I try with a fresh battery.

I had the same problem, whenever i did something cpu intensive, it would just black out.
I just bought a new 3100mAh battery. Best thing i ever did. It might be thicker now with the new battery, but it actually feels more comfortable as a phone. Plus the new battery only cost 13 odd quid, so definately well worth it. Oh and it doubles the battery life (3100/1500 = ~2... duh)
Hope that helps.

oh you know wat i have the same problem with my Jasjar and the bigest problem that there is no batteries on market for Jasjars in my country....its looks like im living in Jurassic Century!!!

If you want i can send you a battery xplayer, they're quite cheap here.

Rc-Blob said:
I had the same problem, whenever i did something cpu intensive, it would just black out.
I just bought a new 3100mAh battery. Best thing i ever did. It might be thicker now with the new battery, but it actually feels more comfortable as a phone. Plus the new battery only cost 13 odd quid, so definately well worth it. Oh and it doubles the battery life (3100/1500 = ~2... duh)
Hope that helps.
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Click to collapse
I ordered a regular battery replacement, but maybe I'll add a 3100mAh as well.
I could use it as a media player during long train trips.

Holy Bear said:
Okay, to tell you what I tried:
I ran the Universal until it spontaneously went dead.
Started bootlaoder to see how much longer it would work on that. Was a bit longer, what with low energy consumption, but soon even that wouldn't stay on for long.
Then decided to try the "old wives' tale" (meaning I don't know whether there's any sense behind it or not) of putting the battery in the freezer for a little while.
When I took it out and let it get back to normal temp, I plugged it in and after a while booted the Universal. It showed 40% battery, lower than it had ever gotten lately.
Recharged for a full day.
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Click to collapse
I revived two batteries by intense cycling to work quite well again. They still black out at 20%, but only under extreme load (active gsm connection, active wifi, bluetooth and having to render a webpage).
But you should be able to discharge them below 25% at least. Else they're most certainly "too dead" already. And you should do at least 3-4 cycles.
My guess would be that the freezer finished your battery off. I don't understand how this method should work anyway, as lower temperatures reduce the time affected capacity loss. Actually the best place to store a LiPo or LIo battery is the fridge, charged about half the way.
But I also ordered two 3100mAh batteries. I'm using the Uni as a laptop replacement and the permanent wifi usage together with some cpu load and the backlight kicks the battery's ass quite hard.
In Germany the China 3100mAhs are overpriced and it's hard to get your hands on an external charger, but on Ebay.co.uk there's a seller that offers battery and charger as a bundle for about 15€. This will give me a solid 6000+mAh per day and should be enough to forget about virtually every setting related to power consumption
@ xplayer
If you haven't donw already, take a look at Ebay.com, co.uk etc and look if one of the sellers there will ship to kurdistan. You may be lucky

Rc-Blob said:
If you want i can send you a battery xplayer, they're quite cheap here.
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Oh Thanx Rc-Blob....bt there is No way even to send me no addresses no posting in my country...am from kurdistan of Iraq...thanks again its looks like u sent me one...bt I even have brother in USA he can't send me...except if some one come from there so i have to wait...thanks buddy...

EvilJogga said:
I revived two batteries by intense cycling to work quite well again. They still black out at 20%, but only under extreme load (active gsm connection, active wifi, bluetooth and having to render a webpage).
But you should be able to discharge them below 25% at least. Else they're most certainly "too dead" already. And you should do at least 3-4 cycles.
My guess would be that the freezer finished your battery off. I don't understand how this method should work anyway, as lower temperatures reduce the time affected capacity loss. Actually the best place to store a LiPo or LIo battery is the fridge, charged about half the way.
But I also ordered two 3100mAh batteries. I'm using the Uni as a laptop replacement and the permanent wifi usage together with some cpu load and the backlight kicks the battery's ass quite hard.
In Germany the China 3100mAhs are overpriced and it's hard to get your hands on an external charger, but on Ebay.co.uk there's a seller that offers battery and charger as a bundle for about 15€. This will give me a solid 6000+mAh per day and should be enough to forget about virtually every setting related to power consumption
@ xplayer
If you haven't donw already, take a look at Ebay.com, co.uk etc and look if one of the sellers there will ship to kurdistan. You may be lucky
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hhh ok buddy you too for care....but there is realy no way i have to wait tell some one(my brothers friend) come from USA so he can get me one from there....its ok...i can use it yet as a normal mobile...i have some other devices for multimedia right now i can wait there is no any other ways....thanks...

Rc-Blob said:
If you want i can send you a battery xplayer, they're quite cheap here.
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Click to collapse
Thanx for helping the guy,yo folks on xda are the best

Just to give you all the end of the story:
I ordered a regular replacement and a 3200 mAh one, and both have returned my Universal to a well-used life.
Thanks again to everyone helping me out here.

For you guys does the device switch off only when the battery is low, or any time. Cause I have this problem as well, and I was SURE that it wasn't a battery problem until I read this thread. The phone switches off intermittently, sometimes after only 3' talk time right after it had been charging for a full 8 hours! Also, usually if I let it sit there for a few hours I could then turn it back on and it would last a full day, so I knew it wasn't due to low battery.
The overheating theory would explain my problem, as, now that I think about it, all my seemingly-random shutdowns were during radio activity (making or receiving calls, especially when the phone was searching for signal, or wifi, which would almost instantly kill it). Strange that it overheats like this, most phone batteries simply run out of charge faster and faster until they can't hold a charge at all, but mine lasts almost as long as it always lasted even though it's 2 years old - unless I get the shutdown thing of course.

I asked this in another thread, but since this one is full of people who got replacement batteries I'll repeat my question here as well:
How much thicker than the standard battery are the 3100 and the 4200mAh ones?

I also got this problem recently, so I bought a new battery and although it's only a 1600mAh battery it runs great again

hey roodkapje ive got that same problem with my battery for my spv m5000 the bad news is that i cant get that batery in barbados so im all out to see

Battery 'Life' tricks

I read about this on a professional site but cannot remember where. Here is what you do:
"To help with battery life you can do these steps EXACTLY:
1. Turn your device ON and CHARGE the device for 8 hours or more
2. UNPLUG the device and TURN the phone OFF and CHARGE for 1 hour
3. UNPLUG the device TURN ON and wait 2 minutes and then TURN OFF and CHARGE for another hour
Your battery life should double. We have tested this on our devices and other agents have seen a major difference as well"
I am still waiting for my phone but I will try this as soon as I get it. I am wondering if this trick applies only to new phones or not? If someone will like to test this please go ahead and give us some feedback. Thanks

no offence but can you tell me how you can charge the device which has been charging for 8 hours? to my knowledge, there are circuits that avoids over-charging in these kind of devices?

You got a point. Like I said, I took this off the net but cannot remember where.

Check out this article: http://blog.gsmarena.com/samsung-i9000-galaxy-s-full-battery-test-ready-–-up-with-the-best/

It's impossible to manage 84h on single charge Or it is possible when you charge phone to 100% then leave it on your desk and don't even touch it.

Im pretty sure I could get up to a week of battery if i didnt use the phone at all. Over night the battery drains 1% max.

rocketpaul said:
Im pretty sure I could get up to a week of battery if i didnt use the phone at all. Over night the battery drains 1% max.
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standby is quoted as 24-26 days. it's sick. screen on is what sucks the power (in addition to sync and background apps).

alovell83 said:
standby is quoted as 24-26 days. it's sick. screen on is what sucks the power (in addition to sync and background apps).
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for me, wifi uses up 65% of the power lol.

I like to ask, how long have you all had your phones? I think the longer or often you charge your phones the better the drainage power.

ive had mine for two weeks

Don't believe everything you read on the internet..
When I was working at an Apple Premium reseller, I nearly exploded with laughter every day at some of the ridiculous rumors I heard, which were obviously wrong to anyone who sold them, but plenty of major sites were reporting they were likely..
Even now, Kevin Rose (the genius who said that he had seen the iPhone and it had 2 batteries) is still saying crap (which 2 years after I left still seems wrong to me), and every site is STILL reporting it as fact.
A lot of the stuff you read on the internet is untrue. This might be a bit true because of battery calibration and such, but I honestly do question it..

andrewluecke said:
Don't believe everything you read on the internet..
When I was working at an Apple Premium reseller, I nearly exploded with laughter every day at some of the ridiculous rumors I heard, which were obviously wrong to anyone who sold them, but plenty of major sites were reporting they were likely..
Even now, Kevin Rose (the genius who said that he had seen the iPhone and it had 2 batteries) is still saying crap (which 2 years after I left still seems wrong to me), and every site is STILL reporting it as fact.
A lot of the stuff you read on the internet is untrue. This might be a bit true because of battery calibration and such, but I honestly do question it..
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Agreed. After all, if these ridiculous battery "tricks" worked at all, then the physics behind them would be built into the chargers by the manufacturers. Unless you think they are crippling the battery on purpose for no reason? Makes no sense.

How Long for 1st Charge

I think the title says it all, with a few of us hopefully getting our phones over the next few days, am wondering how long the initial charge should be.
I'm know in times gone by they used to recommended 16 hrs first charge but how long should we charge for (am hoping you guys advise not long as I won't be able to wait to play with it).

kersey said:
I think the title says it all, with a few of us hopefully getting our phones over the next few days, am wondering how long the initial charge should be.
I'm know in times gone by they used to recommended 16 hrs first charge but how long should we charge for (am hoping you guys advise not long as I won't be able to wait to play with it).
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One review, think it might've been Eldar's, said that a full charge took around 3 hours. If that's true, it's pretty amazing.
I don't think batteries really suffer very much from "battery memory" anymore, so you could probably just turn it on while it's charging! (I did with my Hero and it's fine.)

kersey said:
I think the title says it all, with a few of us hopefully getting our phones over the next few days, am wondering how long the initial charge should be.
I'm know in times gone by they used to recommended 16 hrs first charge but how long should we charge for (am hoping you guys advise not long as I won't be able to wait to play with it).
Click to expand...
Click to collapse
Hmmm we are not really sure at the moment, however, dombledore and staceymobiler can give you that information as they are the only two people here in the forum who have retail SGS2(AFAIK). Also, I am pretty sure that the documentation that will come with the phone will definitely have the details mentioned Just a few more days to go for you to get your hands on that!
Enjoy! And hope that helped

You can charge whatever amount you want, whenever you want. Modern batteries DO NOT require an initial charge, and can be used right out of the box. Out of the box, they'll come with around a half charge, so you can use that half charge before charging, or you can change immediately if you want. It doesn't matter at all.

You charge until the message appears in the notification bad "charge complete, please unplug".
There is no need to charge LITHIUM batteries for 16 hours the first time.
Further, the batt will come with some charge - you can safely use it up first, and charge later.

AJerman said:
You can charge whatever amount you want, whenever you want. Modern batteries DO NOT require an initial charge, and can be used right out of the box. Out of the box, they'll come with around a half charge, so you can use that half charge before charging, or you can change immediately if you want. It doesn't matter at all.
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Hey! Didnt know that!! was still stuck with the old mindset that i will have to charge the new phone out of the box for a specified amount of time and only then will i have be able to use it to avoid the memory effect. Are you saying that this is not required anymore?! wow!

ndnesh said:
Hey! Didnt know that!! was still stuck with the old mindset that i will have to charge the new phone out of the box for a specified amount of time and only then will i have be able to use it to avoid the memory effect. Are you saying that this is not required anymore?! wow!
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Not with Lithium based batteries. Which is good, cause I'm not very good at charging new toys before use.

How to get a full battery charge and improved life

For those who have bad battery life first charge your phone fully while on then turn phone off...plug the phone back into charger while it's off it will be a red light charge until green sometimes it takes another 20 mins .When done turn phone on and plug charger in again it will drop to 99% when 100 plug out now u have a fully calibrated battery..I am on the new firmware btw
HTC ONE rooted,S-Off,SuperCid
HTC ONE rooted,S-Off,SuperCid

What do you basr yourself on for this??
Sent from my GT-N8013 using xda app-developers app

gemini002 said:
For those who have bad battery life first charge your phone fully while on then turn phone off...plug the phone back into charger while it's off it will be a red light charge until green sometimes it takes another 20 mins .When done turn phone on and plug charger in again it will drop to 99% when 100 plug out now u have a fully calibrated battery..I am on the new firmware btw
HTC ONE rooted,S-Off,SuperCid
HTC ONE rooted,S-Off,SuperCid
Click to expand...
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i call BS lol this has been around since the htc hero days

CheesyNutz said:
i call BS lol this has been around since the htc hero days
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Actually it's not b.s I noticed that around 80% my phone would drop down quickly to 70% and 30% would drop 3% instead of 1 so I did this method knowing that my battery was not fully charged.since I have done this no more quick drops...instead of saying b.s why not try it first then come to a conclusion smh
HTC ONE rooted,S-Off,SuperCid

I can vouch for this ...I am only trying to help those who gave bad battery drain...we do flash a lot on xda sometimes **** happens
HTC ONE rooted,S-Off,SuperCid

Instead of clowing u guys should try it..listen phone says fully charged for some but in reality it is not it will rapidly drop for example 90% but drops to 79% rapidly or drops 3% for no reason while screen is on is due to battery not fully calibrated/charged ..This happens from flashing roms sometimes this happens if you have battery issues try this method ..
HTC ONE rooted,S-Off,SuperCid

I used this method a couple of years ago on my DHD. It made a huge difference! i forgot all about this. I'll do it again later.

Thanks, I had a feeling the calibration was a little off since the phone shuts down at around 5%, let's see what happens.

Yeah, I do this on my galaxy note and sometinmes on my new one.
When 100,% through normal charging turn phone off and begin charge again. It will charge just that bit further.
One thing the note does better is thaat when off and charging you get a battery indicator on screen, not so with the one.

WhatsAUsername said:
I'm pretty sure the only way to get a full battery charge is to hold the phone upside down in your right hand, put your left hand on the back, and spin in 3 circles, counter clockwise. You must then quickly plug the charger (within 1 second), and spin the phone around the cable 3 times, in a clockwise direction this time. Only then can you ever hope to have a fully charged battery.
I can vouch for this. :good:
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Man that's total bull...... only 2 circles required
To be real for a minute if I may..... if you monitor the current draw by the phone when charging you will see that when the green led lights the phone is still pulling 60-70mA from the charger so it's still charging and can take a while longer for that draw to fall to 0mA. At this point it's fully charged.
Charging it as the OP suggests does actually allow this extra top up.

I actually think this does help with proper calibration a bit. Not sure why people are acting like children here.
Sent from my HTC One using Tapatalk 2

The topic of batteries makes people go crazy for some reason. I will toss in my own 2 cents, the thread title talks about improving battery "life". In this case we seem to be talking about "battery life per charge cycle" and people should just be aware seeking improvement in this area usually comes at the expense of a different kind of battery life, ie "battery life per phone".
I personally am one of those who is a little irritated by the non-replaceable battery on the One because I intend to keep the phone for many years. This applies to almost nobody else I realize, but for me this thread is a helpful summary of the exact steps I need to *avoid* if I want to get the longest lifetime (measured in years, not minutes) out of the battery.

NxNW said:
The topic of batteries makes people go crazy for some reason. I will toss in my own 2 cents, the thread title talks about improving battery "life". In this case we seem to be talking about "battery life per charge cycle" and people should just be aware seeking improvement in this area usually comes at the expense of a different kind of battery life, ie "battery life per phone".
I personally am one of those who is a little irritated by the non-replaceable battery on the One because I intend to keep the phone for many years. This applies to almost nobody else I realize, but for me this thread is a helpful summary of the exact steps I need to *avoid* if I want to get the longest lifetime (measured in years, not minutes) out of the battery.
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Click to collapse
What's wrong with turning the phone off every once in a while and letting it charge up fully?

NxNW said:
The topic of batteries makes people go crazy for some reason. I will toss in my own 2 cents, the thread title talks about improving battery "life". In this case we seem to be talking about "battery life per charge cycle" and people should just be aware seeking improvement in this area usually comes at the expense of a different kind of battery life, ie "battery life per phone".
I personally am one of those who is a little irritated by the non-replaceable battery on the One because I intend to keep the phone for many years. This applies to almost nobody else I realize, but for me this thread is a helpful summary of the exact steps I need to *avoid* if I want to get the longest lifetime (measured in years, not minutes) out of the battery.
Click to expand...
Click to collapse
I only needed to do it once...for regular charging I recommend charging while off then plug it out turn on and charge will drop to 99% when plugged in charge until light is green..or you can charge normal after this point your battery stats should be good
HTC ONE rooted,S-Off,SuperCid

Arcadia310 said:
What's wrong with turning the phone off every once in a while and letting it charge up fully?
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gemini002 said:
I only needed to do it once...for regular charging I recommend charging while off then plug it out turn on and charge will drop to 99% when plugged in charge until light is green..or you can charge normal after this point your battery stats should be good
HTC ONE rooted,S-Off,SuperCid
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actually i'm totally cool with doing this procedure every once in a while as a way to just what it says, get a few extra minutes of battery life. hell, if very precise runtime estimates are important to you and this helps calibrate that, great. i'm all for that too. i actually *have* tried something like this and my phone didnt die and i'm sure i got a little extra run time that day.
i just wouldn't do it *every* day.
one of the findings in another thread around here (something about battery "health") was the battery ages quicker at higher voltages such as those used towards the end of the charging cycle. if you are willing to constrain yourself to charging the phone to *less* than 80% capacity (ie the opposite of what this thread is about) you will double the useful life of the actual LiOn (or LiPolymer or whatever) material in the phone.
that is all. not trying to discourage anyone from *ever* doing this procedure, just explaining why i actually strive to do the opposite most of the time.
carry on.

Known fact... it is impractical to FULLY charge up a battery while is is in use (hence, being drained). Plain and simple physics at work here and I can vouch for this based on the many years I worked in the Navy charging, repairing, replacing, and rebuilding naval vessel batteries. Granted these are not huge deep cycle batteries but the charging principles are the same.
As as matter of fact, just did the method the OP was kind enough to suggest to us and it worked like a charm. Noticed a higher mv reading on my battery! Not much but I will take it. Who would have figured on that...
+Thanks to OP for bringing this up.
EDIT: For the record, I would normally reach 4310-4313mV... after this I am reaching +4335mV - Not much but I'll take it.

veritasxe said:
Thanks, I had a feeling the calibration was a little off since the phone shuts down at around 5%, let's see what happens.
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That's only because fast boot is most probably enabled...

Kahbrohn said:
Known fact... it is impractical to FULLY charge up a battery while is is in use (hence, being drained). Plain and simple physics at work here and I can vouch for this based on the many years I worked in the Navy charging, repairing, replacing, and rebuilding naval vessel batteries. Granted these are not huge deep cycle batteries but the charging principles are the same.
As as matter of fact, just did the method the OP was kind enough to suggest to us and it worked like a charm. Noticed a higher mv reading on my battery! Not much but I will take it. Who would have figured on that...
+Thanks to OP for bringing this up.
EDIT: For the record, I would normally reach 4310-4313mV... after this I am reaching +4335mV - Not much but I'll take it.
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Ahhhh vindication ...
HTC ONE rooted,S-Off,SuperCid

As fun as it is to mock, this most likely does work. HTC seem to be pretty bad at making battery algorithms, never found myself having to do this on the galaxy nexus or nexus 4. But my battery drops to 85 darn fast now and I'm pretty sure this will help. I remember this was helpful on the desire and desire HD too.
Sent from my HTC One using xda premium

A lot of people say this is merely a placebo effect, but I agree that it works very well for me with my device.
Humbly Sent from my HTC One running Stock+GE UI

Battery Issues

I bought a used Note 4 a few days ago which I've been greatly enjoying using. However it has been behaving rather oddly.
It turned off a couple of times, and at first I thought it was random, but then I realised it was turning off at around 20% battery. It wouldn't turn back on until I plugged it in, but when I did it would tell me that I had ~20% battery left. I then realised that it wasn't letting me charge past ~80%.
I tried calibrating the battery using *#2882# (code may from memory so may be incorrect. I think I then allowed it to drain and was delighted to see that it could get to 0% normally. I attached it to the fast charger, it then quickly reached 80% and then slowly progressed past to reach 100%.
However today (the first trip into the world after the first successful 100% charge) it reached approximately 30%, died like before and then when I plugged it in it said it had 11% battery. The battery usage graph will illustrate my point.
Any ideas anyone?

DavidT3 said:
Any ideas anyone?
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Buy a new genuine battery (preferably direct from Samsung), or get an Anker or PolarCell, sounds like your battery is past its best.

Kinsman-UK said:
Buy a new genuine battery (preferably direct from Samsung), or get an Anker or PolarCell, sounds like your battery is past its best.
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That is something I intend to do, but I've read accounts of similar behaviour and a new battery didn't help.

DavidT3 said:
That is something I intend to do, but I've read accounts of similar behaviour and a new battery didn't help.
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Yes, but it's a used phone, so:
a) you have no idea what the battery has been through or how it has been treated
and
b) you can't be sure it's even a genuine Samsung battery, it could be one of the very convincing fake replacements.
So first thing to try is a genuine replacement battery. If it doesn't make any difference, then at least you have a new one (which will always be better) and a used spare.

Kinsman-UK said:
Yes, but it's a used phone, so:
a) you have no idea what the battery has been through or how it has been treated
and
b) you can't be sure it's even a genuine Samsung battery, it could be one of the very convincing fake replacements.
So first thing to try is a genuine replacement battery. If it doesn't make any difference, then at least you have a new one (which will always be better) and a used spare.
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But equally, I don't want to spend money on a phone I may have to send back. Though I suppose based on my current experience I certainly would want another note 4