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I just bought a T-moble USA version MDA. I love this thing but my battery is draining very fast. For example I charged it over night last night after it was dead and this morning after only making a few calls with my bluetooth I was down 10% in about 15 minutes. It used all the battery yesterday in about 7 hours. I would say I use this thing less then the average user. I have a sd card in it all the time would that make this drain fast. My wifi and blue tooth is off most of the time.
Thanks for any help offered.
Garth
I have found the battery meter not totally accurate for example it may show 85% and then I reboot the device it may show 100% - so be wary of that and make sure you are truly starting from 100%. Bluetooth enabled calls will use a fair amount of juice but poss not as high as 10% in 15 minutes . On low to average use you should be getting about two days use but if you been checking out all the features and playing with you're new toy then 5-10 hours about right.
Make sure that you have all power saving settings enabled found under settings and that the device goes into standby when not in use. hope that helps
get a new?
I bought my Qtek 9100 and hade the same problem... i took it back to the store.. they took the phone and replaced it with a new one and this new one havent been like that.. so i guess that you have goten a "monday morning phone" so try to get your phone replace i did and now the battery remains powerfull atlast 3 days
Thanks for the info I'm going to keep it for a couple of day and if it keeps draining the battery I will swap it for another.
Hi, my batter has been working great since Christmas, but now for some reason won't last more than a fwe hours without saying battery low. I have my gprs check email every 5 minutes, but it has always been that way and I have been gettnig a good 2 days out of my phone before.
Now i take it off of the charger in the morning and then around lunch the batter is low already...
Is my batter just toast?
Should I get another?
THANKS!
T
Just a question, but have you been overclocking your TI OMAP processor? Maybe there's a correlation?
contaygious said:
Hi, my batter has been working great since Christmas, but now for some reason won't last more than a fwe hours without saying battery low. I have my gprs check email every 5 minutes, but it has always been that way and I have been gettnig a good 2 days out of my phone before.
Click to expand...
Click to collapse
Mine is brand new (tmobile MDA) and when I enabled 802.11g I noticed a dramatic drop in battery life. I think for the sake of the battery I will only enable that as needed.
I wonder also if you are in the same proximity to the mobile towers, if you are on a border between coverage you will see a drop in battery life becuase it is transmitting more frequently to register with the mobile network.
To try to see if its your battery or something you are using, and while this may be incredibly difficult with a mobile, especially a mobile/pda that you use frequently, you may want to see about turning off features to see if that helps. Turn off wifi and see if that helps, turn off bluetooth and see about that, etc. Once you rule them out as the major culprit ...
While I highly doubt this may be the case, it is a possiblity, and worth looking into, especially if you noticed a sudden drop in battery life as opposed to a gradual diminishment. You may have some rogue software that is sending out more data via a wireless device than you desire. A worm, trojan, whatever. There are anti-virus packages available, I dont know how good any of them are, http://www.freecabs.de has some, some of the big commercial guys make some. Again I dont think its that becuase of the rules of probability, however it is possible and some have been known to exist in the wild for a few years now.
T,
I had the same thing with my c500, now I know they are two entirely different phones but after I flashed the device it was as good as new in terms of battery life.
It may be worth a try before you go and buy a new battery.
Marc
I have the same problem.
Not overclocking, no anti-virus, just regular phone use and my battery does not last a day!!
I keep it on charger most of the day to avoid shut-down.
me too
I've the same problem and I've an other big problem, when I turn off my Vario, it's dont't start on power botton (i must extract and insert a battery turn on the telephone).
We can make a test if anyone have a HTC diagnostic software (see service manual.pdf)
Check your today screen.
I too had the same issue. Mainly, PhoneDashboard was causing the battery drop. Along with any today elements that poll your hardware to display the amount of battery, memory and storage. Those all drain your battery.
To check whether it's really a today screen issue or not. Charge your battery to it's full 100%, remove ALL today screen elements, then use your mobile normally and keep checking the battery level drain rate.
Hope this was useful.
Mine dies, 100% when leave work, some usage and then dead in the morning.
I only have Pocketbreeze and a few plug ins installed.
There is NO wireless /bluetooth in that time.
KINetics said:
Just a question, but have you been overclocking your TI OMAP processor? Maybe there's a correlation?
Click to expand...
Click to collapse
nope.
I have not been using wifi at all lately either
I have spb today stuff but have had them since I first got my wizard. really, I have not changed anything....
some programs "eat up" battery life. Investigate by doing a HARD reset, then do not install ANY software for two days. I bet you will see your normal battery life ;-)
I took all today programs off
100% at 5.30
32% at 7.30
This is O2 Mini Rom without all the 02 crap.
I will investigate further. Hard reset here we come!!
Last night my battery was 100% at 5.30 after a hard reset, no o2 software installed and very light usage.
This morning at 7.35 it was 50% which is good I guess???
Suggestions as to whether it is the battery?
byronsp said:
Last night my battery was 100% at 5.30 after a hard reset, no o2 software installed and very light usage.
This morning at 7.35 it was 50% which is good I guess???
Suggestions as to whether it is the battery?
Click to expand...
Click to collapse
Still not good enough, should hold for 3 days if you do not use it. Get a battery replacement.
Typically I charge every other day, little phone talks however.
PhoneDashboard was causing the battery drop
Click to expand...
Click to collapse
Ah, I run this. Is it bad? I've turned off all the scrolling updates etc - did you find that helped?
Got a battery replacement but still after no real use dropped to 50% in only 13 hours.
Any other ideas?
mine works for about 5 days normal usage with this options:
- phone on
- bt off
- wifi off
- automatically receive IrDa incoming... (Connections ->beam...)
so the wifi on my batt only last for a few hours, but when you disable wifi and the irda incoming you should have more batt. life
Thanks I will give this a try and have taken out irDA.
However my figures were with Bluetooth and Wireless off as well
I have noticed that with wifi on (and particularly if I'm using it) the battery drops at a frightening rate. Whereas with wifi disabled (which it's been for most of today - first day since I've had the XDA that I've been busy working and so haven't been 'fiddling' with it at all ) the battery still seems to be sitting happily at 80% after around 8 hours.
Funny, I thought that if the phone was suspended, the wifi would be inactive, so the battery wouldn't drop. Appears that's not the case...
Do u have Spb Pocket Plus installed? this program sucked my battery flat in 1 day. I removed it and now its up 2 or 4 days depending on how long i have wifi on. Checking email every 5 min also reduces battery life allot.
goodluck
No pocket plus... My today screen just has phmtray, resco today, taskplus, and the pocketmusic plugin...
Hello,
I have a new S200 and i noticed that every time I charge the battery its life time is shorten - I have omega battery pack installed and in first few time with a fully chard battery the battery meter was at 5 hours but now after 3 weeks a fully chard batters has only 3.5 hours left .
is it possible ?
starnge
I have the same problem with my Prophet -
I have a new Prophet, last month the battery lasted at least 5 hours ( I am using a battery plugin that show the battery time left ) and today if I get 3 hours I am glad , no changes ware made to the device .
I turn my Prophet Off every night - could it be the problem ?
You didn't enable the bluetooth or wifi option? Because those eat up battery quite fast. And did you do a rom update? Some gsm updates cause more drain on the battery.
And perhaps it could be some programs use up the battery, but can't be sure about that though.
My BT is enable because I use BT headset all the time and I'v upgraded my rom to"RUU_Prophet_220734_2207114_024721_QtekWWE_Ship.exe" .
I heve no programs running at all (except 3 from the startup).
But the main problem is not how fast the battery ends, but a full battery last 3 Horus when a month ago it lasted 5 ...
Mine discharges in a day, without any call made and only 30 min of usage
Have U tried switching the IRDA off ? 'Cause by default it's on.
the irda kind of doesn't consume at all..
I guess I had this trouble with every phone I got, the first 2 weeks are always giving better battery time, and it quickly decrease to a more "stable" state... Don't know why btw...
Are you still noticing a shortened battery life now compared to last week ? Keep testing, I bet this is already gone.
i doubt that it gets to a "Stable" state. i've been experiencing the same strange issue for 2 weeks now, in the exact same conditions as described in the first post (battery pack pro installed). i don't use IR/BT, i have no viruses, it's just the same phone. it also turns off from time to time, on no apparent regular basis. i am just preparing to rewrite the ROM, perhaps it helps.
p.s.: i've been using it for some time now (since it came on market), so it's kind of strange this started happening so sudden.
if there are no other obvious reasons you might try this tweak, which, they say, is helpful sometimes. I did it and now my phone loses 1-2 percent in standby mode in 7-9 hours and one battery charge lasts for 2.5 days of moderate use. good luck.
http://www.mobiletopsoft.com/board/...nd-activesync-from-draining-your-battery.html
avionaru said:
p.s.: i've been using it for some time now (since it came on market), so it's kind of strange this started happening so sudden.
Click to expand...
Click to collapse
Did you install the A2DPfix.cab to avoid the skipping problem ?
Hello
Just got my blackstone, had it for a few days and i need to charge it every day, almost 2 times a day with moderate use. I turned off 3G, turned down the backlight. But still, if i just mess with it a little, in settings and so on, i can litteratly see the battery life getting lower. An hour ago it was 100%, now its on 83%. Any one who got some pointers on this?
Thanks.
I had a similar issue with mine, got it a couple of weeks ago with a stock Orange UK rom onboard.
Battery hasn't fully depleted, but I usually charge it everynight as it quick charges.
I've since put Dutty's 3.9XT Turbo rom on and battery life has been a lot better.
For example, charged overnight last night (from 59%) and am now at 90% after a few texts and emails. Normally I struggle to hold a 3G signal in my office so its alternating between G, 3G and H all the time, which also drains the battery, and have a push mail application running in the background.
I also charge it in the car in my cradle to and from work. Could probably get two days at a push if I needed to, but it would require charging in the car as well to do that.
Thanks. I flashed it with the energy rom, and the battery really sucks. What does actually the "H" mean, when that is in the status field? "E" is edge, G is 3g, but "H" is?
Try disabling 3g to see better battery life. I think my battry life is quite good without 3g. Running latest energy rom. H is hspda I think. Disable that also to check the affect on battery life.
Thanks. Ive done all that. 7 hours ago the battery was at 100%, now its at 15%. Ive texted 5 messages, and made 2 phonecalls. If i go into settings f.example, press a little, i can see the % gone down a few. Something must seriously be wrong.
bthelastman said:
Thanks. Ive done all that. 7 hours ago the battery was at 100%, now its at 15%. Ive texted 5 messages, and made 2 phonecalls. If i go into settings f.example, press a little, i can see the % gone down a few. Something must seriously be wrong.
Click to expand...
Click to collapse
Yeah, somethings up with it. To compare I took mine off the charger 7 hours ago sent 4 emails, used gps 3 times, browsed several sites for a total of about 45 min., made two short calls and I'm down to 75%. Thats all on edge.
bthelastman said:
Thanks. Ive done all that. 7 hours ago the battery was at 100%, now its at 15%. Ive texted 5 messages, and made 2 phonecalls. If i go into settings f.example, press a little, i can see the % gone down a few. Something must seriously be wrong.
Click to expand...
Click to collapse
Definitely sounds like a more serious issue.
I have 3G and HSDPA on all the time and still get through about 25% battery during most of the day, with a few texts, a call or two and some email/browsing etc.
I also make sure that I close any other applications that I've finished with to calm memory and processor usage down.
Thanks. Yes, it sounds like an issue. Wish i had you guys battery. I can litteratly see the % go down, if i go to settings, press something go back and so on. Bought a new 1350mah battery on ebay, hope that would do the trick. Its bugging me sooo much, breaking swet becouse of it, lol.
Did you also turn off bluetooth and wireless? I get three days out of mine without 3G.
Yeah, all that stuff is off. Only edge is on. The battery must be faulty, thats the only thing i can think of. Example, made a phonecall now for 5 minutes, it dropped 10% on the battery.
bthelastman said:
Yeah, all that stuff is off. Only edge is on. The battery must be faulty, thats the only thing i can think of. Example, made a phonecall now for 5 minutes, it dropped 10% on the battery.
Click to expand...
Click to collapse
bthelastman,
Try these following steps to recalibrate your battery.
1) Turn off the phone.
2) Let it charge overnight and don't unplug it.
3) In the morning, use the phone till it is down to 10% (Don't go lower than this number).
4) Turn off the phone, and do a full-charge again.
Repeat these steps 2 ~ 3 times and see if the battery gets better. Sometimes, it is not that the battery is bad, but merely the calibration is a little off. Always try to charge your phone when it is turned off, it keeps the accuracy of the battery lasting much longer without having to do a full-discharge.
Let us know how this works out for you.
Cheers.
Cheers.
Thank you PoisonWolf, i will test this out. Thanks.
PoisonWolf said:
bthelastman,
Try these following steps to recalibrate your battery.
1) Turn off the phone.
2) Let it charge overnight and don't unplug it.
3) In the morning, use the phone till it is down to 10% (Don't go lower than this number).
4) Turn off the phone, and do a full-charge again.
Repeat these steps 2 ~ 3 times and see if the battery gets better. Sometimes, it is not that the battery is bad, but merely the calibration is a little off. Always try to charge your phone when it is turned off, it keeps the accuracy of the battery lasting much longer without having to do a full-discharge.
Let us know how this works out for you.
Cheers.
Cheers.
Click to expand...
Click to collapse
PoisonWolf mate these techniques used to work on old battery but the new lithium batteries don't need these manual calibration process...
akash_nu said:
PoisonWolf mate these techniques used to work on old battery but the new lithium batteries don't need these manual calibration process...
Click to expand...
Click to collapse
akash_nu,
I beg to disagree. What I am saying is, sometimes, the battery in itself can hold the right amount of charge, but the onboard motherboard thinks it is not holding the right amount of charge. The full-discharge helps correct this issue.
If you don't believe me, keep charging your TouchHD whenever it is at 80 ~ 90% for a couple of months and you'll notice a "drop" in how fast your battery drains.
Cheers.
I definitely agree with this.
My Touch HD kept dying after a couple of hours, even when charging it over night. So I turned my phone off and charged it over night with a wall charger (instead of USB) and then it lasted for 48 hours with the same usage.
I think the battery tells the phone it is fully charged even when it is not. So like you say, it just needs recalibrating.
Not sure why the post appeared twice, I only submitted once!
Hi,
The button to the top wright of the phone, to close apps, the screwdriver icon says 59%. I guess that means running 59% of its power of whatever?
Shouldnt it say like 0%, since no apps are running?
Thanks.
After eight months and having my battery give me 2 minutes of talktime on a four hour charge, Orange UK have replaced it for me FOC.
bthelastman said:
Hi,
The button to the top wright of the phone, to close apps, the screwdriver icon says 59%. I guess that means running 59% of its power of whatever?
Shouldnt it say like 0%, since no apps are running?
Thanks.
Click to expand...
Click to collapse
That % shows the amount of free RAM your device has, not how much power it is consuming..
Not sure why you are having this problem, I use BB Connect all day at work and am on the phone for several hours, I don't have 3G in the US but notice if I have WiFI on it drains the battery fast.
Are you sure you don't have a program running that is always looking for the internet? You could try HD tweaks and turn off the internet all together and see if that helps.
Anyone else experiencing excessive battery drain on their HD2?
I am interested to know if this is just my phone or if it actually just chews through that much juice.
I have had windows mobile phones for several years so I know all the basic ways to keep battery drain down.
Stuff that I have generally found:
1. If I keep the screen turned on without it going blank I lose about 1% every 2 minutes.
2. If I am browsing that figure almost doubles.
3. My old Touch HD used about 5% battery overnight when in standby but this phone will go through about 25%.
4. The phone gets really hot when browsing (much hotter than my old Touch HD)
I have tried flashing ROM's and Radios but nothing seems to help.
I am not running any software on the phone that I wasn't running on my old HD1.
I have only had the phone for a week so I am not sure if this is normal but I would be very surprised if HTC released a phone that lasts for only a few hours on one battery.
+1
-1% every 3 minutes
-4% during the night (when i'am sleeping)
MAXIMUM : 45/48 HOURS
Crash95 said:
+1
-1% every 3 minutes
-4% during the night (when i'am sleeping)
MAXIMUM : 45/48 HOURS
Click to expand...
Click to collapse
I wish I got 2 days
we really need extended battery ,hd1 battery was much more better.
Good mate but yes i agreee HTC has come up with a battery eating device this time around. My device on full charge just gives in around 8-10 hrs. This might be dat my EDGE is on and 7 mails accounts sending mails back and forth.
but truly i think that HTC better look into this very seriously cause more and more ppl are suffering in this battery drain..
Any of flashing roms and radio not helping either... did a complete hard reset but no step up
HTC come with longer battery battery for bigger devices soon......
The only solution i see now is get one of those extra battery worth mind bogling £52.87
I've had this problem ever since flashing to 1.66, I flashed the radio to 2.07.50.27 as this was said to solve the problem but it hasn't made any difference after a few days of use. My battery life used to be significantly better when I was on the original stock ROM, so much so I'm considering going back to it
I also know all the tricks as to clawing back the battery drain, my phone is idle on my desk at work most of the time and I don't use Wi-Fi, all the location stuff is turned off as are weather, stock and other updates plus my screen is set to 30% then off after 60 seconds. Despite all of that I lose 1% every 2-3 minutes
It seems to me that perhaps the radio is checking for reception pretty much constantly rather than say, 5-10 mins perhaps? This used to be a problem on my old Blackberry Storm but a few fimware updates solved it, eventually!
The only other thing I've noticed since the update is that once the battery drops below 50% or so, the drain seems to slow, I don't know if this is perhaps because the phone goes into some sort of semi-power saving mode?
Suggestions/hints welcome! I've had a semi-thorough look into this on the forums and tried most of the suggestions but still the problem remains. Will battery life improve after a few charges perhaps as this was a trait of my Storm's battery, the more you charged it the better the day to day battery life was (and no it wasn't because I had it plugged in all the time! Over time the general charge just seemed to improve when roaming).
Thanks!
Piemole said:
Anyone else experiencing excessive battery drain on their HD2?
I am interested to know if this is just my phone or if it actually just chews through that much juice.
I have had windows mobile phones for several years so I know all the basic ways to keep battery drain down.
Stuff that I have generally found:
1. If I keep the screen turned on without it going blank I lose about 1% every 2 minutes.
2. If I am browsing that figure almost doubles.
3. My old Touch HD used about 5% battery overnight when in standby but this phone will go through about 25%.
4. The phone gets really hot when browsing (much hotter than my old Touch HD)
I have tried flashing ROM's and Radios but nothing seems to help.
I am not running any software on the phone that I wasn't running on my old HD1.
I have only had the phone for a week so I am not sure if this is normal but I would be very surprised if HTC released a phone that lasts for only a few hours on one battery.
Click to expand...
Click to collapse
You need to indicate what services you have running. Do you have any data services running eg: location services, push mail, weather? all of these have a bearing. In addition, network services can also drain a battery, especially if the signal is weak and the phone have to search for a transmitter, or 3g services.
Hexjibber said:
The only other thing I've noticed since the update is that once the battery drops below 50% or so, the drain seems to slow, I don't know if this is perhaps because the phone goes into some sort of semi-power saving mode?
Thanks!
Click to expand...
Click to collapse
That is a very interesting comment. Although since upgrading to radio 2.07.51.05_2 I have had very good battery life, I too have noticed a slowdown after 50%
romac said:
You need to indicate what services you have running. Do you have any data services running eg: location services, push mail, weather? all of these have a bearing. In addition, network services can also drain a battery, especially if the signal is weak and the phone have to search for a transmitter, or 3g services.
Click to expand...
Click to collapse
Nothing is turned on, everything is set to manual.
As I stated I know all the basic stuff. I understand that all these things have a bearing on battery loss.
Everything I stated in the first post is for when I have nothing running. The phone is just sitting there running sense, thats all.
I have had my HD2 for a few days now. I am on Vodacom in South Africa.
I have not had a problem with battery life.
Yesterday i unplugged from the charger at 07:00. I spent about 1 and 1/2 hours of talk time on the phone, it was permanently connected to 3g doing weather updates etc. Sent and received a couple of sms's. Also played with a few tweaks and reboots.
When i got home at about 18:00 i had over 30% battery. I then surfed the web for over 2 hours to drain the battery.
try setting Network Selection to Manual
Piemole said:
Anyone else experiencing excessive battery drain on their HD2?
I am interested to know if this is just my phone or if it actually just chews through that much juice.
I have had windows mobile phones for several years so I know all the basic ways to keep battery drain down.
Stuff that I have generally found:
1. If I keep the screen turned on without it going blank I lose about 1% every 2 minutes.
2. If I am browsing that figure almost doubles.
3. My old Touch HD used about 5% battery overnight when in standby but this phone will go through about 25%.
4. The phone gets really hot when browsing (much hotter than my old Touch HD)
I have tried flashing ROM's and Radios but nothing seems to help.
I am not running any software on the phone that I wasn't running on my old HD1.
I have only had the phone for a week so I am not sure if this is normal but I would be very surprised if HTC released a phone that lasts for only a few hours on one battery.
Click to expand...
Click to collapse
Same here with and without stock ROM.
yeah.. the phone is a battery sucker.... another cons of HD2....
This is very interesting to read because I do not have this problem. When I left my HTC HD2 on last night (I woke up at 4 in the morning to get something to drink and unplugged it) and then woke up at 8, it was at 98%. That means it went from 100% to 98% in 4 hours. Not to bad imo.
I am now at work and it is 15:34, and I am at 87%. I have made some calls, watched some videos, send a few text messages. Not much (I am at work so I got other things to do). So 08:00 (98%) - 15:34 (87%) - that's 7 and a half hours, with some calls, text messages and a video.
I am pretty sure when I get home at 18:30 the battery will still be above 75%. Then I connect to my wifi at home, refresh twitter, weather, browse the web a little bit, check e-mail etc. So that will drain my battery a little more.
But overall I have not had any problems with my battery life. I always make it trough a day, and never have a problem like 'damn my battery is almost done and I am not near a charger'.
Some info that might help:
I do not sync ANYTHING automatically. I still have some things to do with my Vodafone contract and do not have an unlimited plan yet. I only sync at home on my own wifi connection. For me this is not a problem, because I only need to refresh the weather each morning to see what the day is going to be like. Twitter I only do when I have the time. Stocks I do not use.
I have screen brightness set to automatic.
I am on 3G most of the time.
I am running the official 1.66 Dutch ROM.
I have some tweaks, games and programs installed.
I hope you all solve this issue, because it just can not be that my HD2 has a good battery life, and your HD2 not
Kind Regards
EDIT @ 17:00 still 87%.
I am in a 3G 2100 only network (I don't have 2G functionality).
ROM: Artemis 3.0
Radio: 2.06.50.23_3
Customization: Seiya 6.5.5
I don't leave any automatic updates on, except for my e-mail account every 2 hrs.
I never close my connection.
The drainage overnight is -3% (8hrs).
The battery lasts at least 12 hrs of intense usage.
Normally I have to recharge every second day (e.g. I charged last night, I answered a few calls, I did some IM and browsing and I still have 73% left).
For a phone with a 1 GHz processor, a 4.3" screen and a tiny 1250 mAh battery I find the drainage is rather decent.
Mind you, I ALWAYS do at least one full charging cycle to my battery after flashing a new ROM. I mean: full discharge, battery out 1 min, full charging in OFF mode, battery out 2 mins.
27firesnake said:
Mind you, I ALWAYS do at least one full charging cycle to my battery after flashing a new ROM. I mean: full discharge, battery out 1 min, full charging in OFF mode, battery out 2 mins.
Click to expand...
Click to collapse
I have seen this process recommended a couple of times now. What is the theory behind it if you don't mind me asking?
maybe its also becouse some of us couldnt wait using the hd2 when they got it (like me) before it was fully charged for the first time
anyway my battery life has improved a little bit, i was at 74% this morning and did a lot of browsing, installing, tweaking and now its at 3%. it used to be much worse
I have battery consuming problem from time to time.I did everything:
installed new stock rom 1.66;
transfered all data which phone is using from card to phone memory(pictures,icons,sounds.etc...)
all updates are done manually;
Gprs connection is swiched off on the idle after one min;
One night it is loosing from 2 to 4%;
another from 30 to 40%
and it is eating memory from 10 to 15mb
I think that it is radio which is causing battery drainage so fast(to much communication wit a base stations,because when I am checking spb wireless monitor in the morning,there is no any data traffic.
I hope they can solve problem,because it is getting me mad and crazy
Try setting the screen brightness to 10-20% (on battery powered)
and dim backlight after 10 seconds (on batter powered).
It helps a lot, at least for me.
creed said:
I have seen this process recommended a couple of times now. What is the theory behind it if you don't mind me asking?
Click to expand...
Click to collapse
as far as i know, the battery has an integrated digital circuit (ic) which estimates the state-of-charge (soc). the procedure resets/calibrates the ic to obtain a more accurate estimation. since the radio rom is in charge with the power management (among other things), by changing it you decalibrate the "gauge".
i don't know if i've got the theory right but i tested this myself and it surely works.