Database Users

Time to fully charge battery

hello
just recieved my HD2 and I've drained my battery to 0%. now I was wondering how long will it take to 100% charge again.. 3 hours? 8 hours?
deiota
ps. Ive done my first 12hours charge already

With the original charger, about 2hrs if you don't use it at the same time.

yes Im using the orginal charger and the hd2 IS power off.

the stuff about charging for hours when you get it and then draining it right down no longer really applies too our batteries.that was for nickle batteries to initialise them and prevent the memory thing. with lithium ion they no longer suffer from battery memory.

ýeah it took about 2 h

2 and half ours starting from zero charge

I never did anything with the battery when i got mine!! Was way to eager to play! Never had any Battery issues.....
I did loosely time it once as i wanted to know what difference a quick charge would make and it seemed like it went up a percent approx every 3 mins... trouble is that doesn't quite equate... it would mean that from 0 - 100% would take 300mins (5hours)! but in reality it probably takes between 2-3hours..
I guess either the battery doesn't charge linearly or the percent display is inaccurate...

I Did a full charge at lunch time since it took me 1day and half till battery to drain completely,
I wonder if I should put it on charger all night long (its 10pm now and I have 80%) or should I let it out of charger...

If your battery needs charge, then charge it. There is NO NEED to completely discharge it and then charge it for sveral hours. In fact, modern li-ion batteries will take damage if _completely_ discharged!
The thing about completely discharging and charging for days is long gone! Batterys have evolved, we dont live in the 1990's anymore

Just got my HD2 how long for first charge??

Cheers
Baker0

Charge untill it shows that the battery is full. That is, 100% and the led lights green. It takes about an hour.

I always thought you have to do a longer charge for the first time. Or is that BS?

Was true with old phones but not with new batteries. I'd still give it a few hours though - does the manual not say anything?

just charge and go...

Yes it is tru with old phones, in the 90's., you had to charge them a long time. But that is a decade ago.

Charge it untill orange led turns green !
The battery will not overcharge as it stops charging when full !
Battery life at first was terrible 8-12 hrs
I found that if you charge it then use the phone untill the battery runs out (ie low battery warning) then charge it again & keep doing it that way the battery life gets longer & longer im now getting nearly 3 days without a charge !!

[Q] Battery life of SGT P1000

Hi everyone,
How long do you charge your SGT to an ac/dc outlet? And how long does the battery life lasts after its fully charged?
Advance thanks!

For mine, charging time (AC) typically 4 hours (from 5 to 10% left). Usage time is subjective, continuous usage on games or music varies differently. I should said, about 6 hrs plus of continously usage on WIFI & games.

Mine takes a long time to charge, nearly 7-8 hours from 0 to full! Don't know why it's so slow considering I am using the original power cable provided by Samsung!

By far the quickest method to charge the Tab is to first power it down so it is totally switched off.
Now plug in the cable and charge using the supplied power plug.
You will notice a marked difference in time taken to charge fully.

Pat123 said:
Mine takes a long time to charge, nearly 7-8 hours from 0 to full! Don't know why it's so slow considering I am using the original power cable provided by Samsung!
Click to expand...
Click to collapse
This is an important issue so shall we do a systematic comparison? First,we will charge the battery 100% then we will watch a movie at 100% brightness setting for exactly 1hour. Close the movie and check battery %, report here. Game?

According to my usage scheme (except calling), I manage to get 2 days on my GTab when my NS or MT4 needs to change battery once during a day.

Mine takes about 3 1/2 to 4 hours from about 20-30%. I did a lot of reading on lithium ion batteries and what I found is that the more you fully discharge and charge the worse the battery gets, which is the EXACT OPPOSITE of the old style nickel cad batteries.
In order to prolong the life of your SGT battery (which is crucial since we cant removie it) it is recomended that you top off your charge whenever you can. I work part time and am a full time college student so I always have about 4 hours every morning, wether its at work or at home. So once a day I charge my tab, its usually in the 20%-50% range when I charge it.
Just make sure that you do infact have the time to complete the full charge and remember that the last 10% will take the same amount of time as the first 40% due to the fact that li-ion's do the trickle charge at the end.

I charge it over night, every 2 days

For me the longer charge time usually is from 99% to fully charge. That can take up to an hr.

n2s2k2india said:
This is an important issue so shall we do a systematic comparison? First,we will charge the battery 100% then we will watch a movie at 100% brightness setting for exactly 1hour. Close the movie and check battery %, report here. Game?
Click to expand...
Click to collapse
Yep, sounds good! Also, let's keep the phone radios ON i.e. no airplane mode and the movie should be running from External SD card! Will try it out tonight with 3 Idiots movie which was bundled with my Tab

Pat123 said:
Yep, sounds good! Also, let's keep the phone radios ON i.e. no airplane mode and the movie should be running from External SD card! Will try it out tonight with 3 Idiots movie which was bundled with my Tab
Click to expand...
Click to collapse
I watched a full movie. There was a drop of 20%. Normal?

MasterRy88 said:
Mine takes about 3 1/2 to 4 hours from about 20-30%. I did a lot of reading on lithium ion batteries and what I found is that the more you fully discharge and charge the worse the battery gets, which is the EXACT OPPOSITE of the old style nickel cad batteries.
In order to prolong the life of your SGT battery (which is crucial since we cant removie it) it is recomended that you top off your charge whenever you can. I work part time and am a full time college student so I always have about 4 hours every morning, wether its at work or at home. So once a day I charge my tab, its usually in the 20%-50% range when I charge it.
Just make sure that you do infact have the time to complete the full charge and remember that the last 10% will take the same amount of time as the first 40% due to the fact that li-ion's do the trickle charge at the end.
Click to expand...
Click to collapse
Thanks for pointing out.I was following the old ni-cad battery method! So,basically you and Beards above are contradictory?

Differences between both types of batteries.
http://www.ehow.com/about_5449906_lithium-vs-nickel-cadmium-batteries.html
Basically, no harm discharging the batteries if constantly using. However, it is best to charge it before storage (probably for a period of time) and do a full charge when using.

3-4 hours charging time. one time i got it to last for 3 days (79 hours). i have a screencap but i need 3 more posts to put the links here. my normal usage is 2 days.

henrylam said:
Differences between both types of batteries.
http://www.ehow.com/about_5449906_lithium-vs-nickel-cadmium-batteries.html
Basically, no harm discharging the batteries if constantly using. However, it is best to charge it before storage (probably for a period of time) and do a full charge when using.
Click to expand...
Click to collapse
Lithium rechargeable battery dies totally (no longer accept charge) if it's left totally discharged for a few months. In addition, it's better to "condition" (totally let it runs out and charge it immediately till it full after about 1-2 months of use) to keep optimized performance.

n2s2k2india said:
Thanks for pointing out.I was following the old ni-cad battery method! So,basically you and Beards above are contradictory?
Click to expand...
Click to collapse
When I said "power it down" I did not mean to let the Tab run down until it powered off.
What I was saying is to get the quickest charge method it is best to 'switch off' the Tab ('power it down' & 'switch off' = same meaning).
The correct usage for the Tab's battery is when new to first fully charge and then discharge several times. Once you have done this the battery will be optimized.
From now on it is best to keep the battery 'semi-full' and not let it run down completely. I normally let mine run down to around 50% and then recharge to full.
However, after every 30 recharges it is a good idea to 'reprogram' the battery by clearing out any memory loss (I know, I know... they don't suffer memory loss). What you need to do is after every 30 recharges let the battery run completely down and I mean completely until it will switch itself off.
Now with the Tab switched off, recharge. Once the large green battery icon is full leave it in for a further 1hr then disconnect.
If you are not going to use the Tab for a long and lengthy period (heavens knows why though), to optimize the battery never stow away a battery which is in a Full Charge.
Batteries that are not going to be used for a lengthy period should only be charged to around 70% and then left in a cool and dry place.

That was very instructive ,infact I copy pasted it in Color Notes. So, basically, 30 recharges is like once a month, I can put a reminder in the Calender. Thanks and I also pressed the button.

n2s2k2india said:
That was very instructive ,infact I copy pasted it in Color Notes. So, basically, 30 recharges is like once a month, I can put a reminder in the Calender. Thanks and I also pressed the button.
Click to expand...
Click to collapse
No problem...
...... and thanks for the vote. All votes are gratefully received as they are converted into a charitable donation.

[Q] To fully charge or not to fully charge?

So I'm now waiting for a Wifi Xoom to arrive at my door, I wanted to see your thoughts about 'preparing' the battery to maintain maximum charge. I'm in two mindsets:
a) Should I just use the tablet with the power it comes with (from what I've read it is around 60-80%) until fully drained then charge completely, or
b)Should I put the tablet straight on the charger and full charge before any use.
Although the battery is replaceable, I'd prefer to make it last as long as possible. Or am I just being to fussy and lithium-ion (or whatever it is) doesn't have a memory effect? Appreciate your thoughts
EDIT: Sorry, this should probably be in the Q&A section.

Heb48 said:
lithium-ion (or whatever it is) doesn't have a memory effect?
Click to expand...
Click to collapse
This. Play with it then charge it or charge then play or play and charge at the same time. Doesn't matter.

Bonus!! Now to wait for it to arrive.

People will spin you all kinds of yarn about how to 'condition' a battery, personally I think it's a nonsense. I drain from the box and charge, just because I want to play with it before I put it back down again.

Check out this thread! There is some discussion on that too.

I drained the crap out of it the first day ... trust me it took a lot of effort because it came out of the box with like 80%. Ended up playing HD videos for hours before it finally went down to 2% ... couldn't wait any longer so I charged it up (btw, the charger does like 1% per minute.. not bad!)
Since then, I just charge it when it goes below 30-40% (like every 2 days of heavy usage)

I drained mine until it was dead and then fully recharged it until the green light was on. Now I just repeat the cycle over and over but I usually dont let it die. I wait for the warning sound at around 5%.

Why does this phone take so long to charge?

I have had it plugged into the mains, running tunein radio through wifi and its gone from 85% to 86% in one hour.
If I charge from 10% with phone off it takes about 4 hours to fully charge
If I charge from 10% with my phone on running stuff, it actually never gets to fully charges by the time I finish work...at 6pm
Sorry to keep comparing to the dreaded FruitPhone, but that would charge whilst running wifi and tunein from 10% to 100% in about 2 hours.
I am beginning to think my SGS2 is faulty

i am fiding it takes about 3 hours to charge from empty . It does take a long time indeed but i guess it is what we have to do for a 1650mah battery

3 hours from empty with stock charger .
jje

it might well be a 1650 battery, but it starts to get unusable when it takes all day to charge then a few hours to loose it all.
This phone is the greatest but the battery life just completely destroys it, I am beginning to think I made the wrong choice

JJEgan said:
3 hours from empty with stock charger .
jje
Click to expand...
Click to collapse
Is that while using it?

you are not supposed to use the phone when its charging its really bad for the battery it gets very warm during charging as it is...

virussnake said:
you are not supposed to use the phone when its charging its really bad for the battery it gets very warm during charging as it is...
Click to expand...
Click to collapse
Aye... if I don't the bloomin thing would be dead by lunchtime, and I listen to music.
So I basically have to turn it off not use it so I can charge it, how crap is that, owned my iphone a year never had any problems with battery and I always used and charged in its dock.

The desire had slow charging too but snq- fixed this in his kernels maybe we can port his fix to our kernels
btw it's true li-ion batteries degrade quicky when the heat up (or completely charge or discharge)

From 30% it took me one hour and a half to fully charge..
I recommend to download battery mix as it takes very good statistic on the battery life and one can tell exactly how long it takes to charge and discharge
Sent from my GT-I9100 using XDA App

just for the record all Lion batteries in phones never fully discharge or recharge, as there balanced by a balancing chip.
when you get to the likes of 0% you actually have 20% charge, thats why you can power on the phone but it will immediately switch off again. like wise, charging you never reach 100%, it's more like 89%, again because of how Lion works.
if you fully discharged and fully recharged, well put it simply you'd have a lot of exploding phones, fire and chemical burns...

Interesting!
My phone charges in about 2,5 - 3 hours, so should be normal...
But charging with the usb cable connected to the pc it takes much longer.
Any of you experience the same thing?
greets!

THUDUK said:
I have had it plugged into the mains, running tunein radio through wifi and its gone from 85% to 86% in one hour.
If I charge from 10% with phone off it takes about 4 hours to fully charge
If I charge from 10% with my phone on running stuff, it actually never gets to fully charges by the time I finish work...at 6pm
Click to expand...
Click to collapse
Because:
a) That´s how Li-Ion-batteries are charged. To fully charge a Li-Ion-battery you need 3-4h.
b) The power-supply is pretty weak. It is just enough to charge the phone at decent speed, but it is not enough to charge it and intensely use it the same time. In this case much of the power is used by the phone and there is not enough left to do a proper charging. I use a 1,2A power-supply from my old Nokia, and while it won´t speed up charging itself, at least it slows down less when I´m using the phone while charging.
Sorry to keep comparing to the dreaded FruitPhone, but that would charge whilst running wifi and tunein from 10% to 100% in about 2 hours.
Click to expand...
Click to collapse
This is not possible. The mighty fruity-phone may tell you it is 100% charged, but certainly it isn´t
You can charge a Li-Ion-battery very fast from 0 to 70-85% you could reach this in 1h. But you have to charge the remaining 15-30% very slowly, otherwise the voltage would raise too much and destroy your battery.
The so called saturation-stage (the charging-stage until 100%) takes longer the faster you charged at the beginning. If you really charged until the saturation-stage in 1h, the saturation-stage will take 2-3h.
If you charge slower, so you reach saturation-stage after 2h, the saturation-stage will only take 1-2h anymore.
In the end it will always take 3-4h to fully charge a Li-Ion-cell, regardless how strong your power-supply is.
Another few notes:
Charging will get slower the fuller the battery already is.
Using the phone with low battery-percentage will lengthen the charging-time quite a bit, a stronger power-supply could help.
Getting the last 20% in a Li-Ion-cell will always be very slow, usage of the phone won´t influence this a lot, and a stronger power-supply can´t help.
It doesn´t matter much, how much charge is left in the battery, to fully charge it it will always take long, as you spend most of the time in the saturation-stage (the higher the left percentage is, the more time you spent in saturation-stage)
I am beginning to think my SGS2 is faulty
Click to expand...
Click to collapse
It is not faulty, it is designed this way.

It took 3 hours 10 minutes to fully charge my dog and bone yesterday whilst off

Thanks for the explanation!

jonny68 said:
It took 3 hours 10 minutes to fully charge my dog and bone yesterday whilst off
Click to expand...
Click to collapse
Your having a bubble bath ain't you mate
Your battery sounds faulty to me, taking over 4 hours and only charging 1 percent in an hour. Try the battery calibration app in the market, if it doesn't improve get it swapped mate
[email protected]
Sent from my Samsung Galactic Crusader S II

The wifi is the killer, try turning it off when charging your phone..
Sent from my GT-I9100 using XDA App

it takes so long to charge because samsung capped the charge current at 650 mA in the battery driver. but other phones like HTC allow charging at the full 1 amp. so that's why its a slow charge, and why its possible to drain the battery even while plugged in to the charger.

Now who wants to ask kernel developers to increase that to .850 or 1 amp and use that lol.
I believe lack of heatsink due to design is the culprit behind decision to cap it at .650.
Sent from my GT-I9100

3 hrs to fully charge, and as i use tunein radio a lot i can tell you on my device with the screen off, wifi on with tunein running, it still seems to take no more than 3 hours maybe 15 mins more at most

I am probably going to order a cheap eBay Li-Ion battery that's 1800mAH and likely has a charge cap closer to 1000mAH. I will know in a week when I finally get my phone and report back if that battery helps. I expect it to heat up while charging and am going to use an external charger.
Two replacement batteries and an external charger go for about $12 USD on eBay btw.