- 07-26-2010, 03:42 PM #51
- 07-26-2010, 03:47 PM #52
- 07-26-2010, 04:10 PM #53
- 07-28-2010, 05:32 PM #54
- 2 Posts
Lithium ion batteries aren't subject to the battery memory problems that the older nickel cadmium battery technology suffered from. The reduced charge capacity that you notice from lithium ion batteries aren't due to memory, but due to the chemical components of the battery slowly degrading due to discharge and no longer being able of holding a charge.
The ideal storage state of a lithium ion battery is 40-60% charge as it reduces the breakdown of the battery chemical components over time. Keeping the battery at 100% charge all the time actually speeds up the chemical breakdown process.
- 07-29-2010, 02:08 AM #55
- 07-29-2010, 09:48 AM #56
- 07-29-2010, 11:13 AM #57
I'm no battery expert, so maybe you can explain if I'm wrong.
- 07-29-2010, 11:26 AM #58
- 158 Posts
Although Apple and other manufacturers recommend running a device until it will no longer turn on in then do a full charge. This is in order to calibrate the electronics - so the phone knows what zero is and what full is.
The phone will not really let the battery discharge 100% as it is monitoring the battery and will shut off at a certain point and then not turn on.
I occasionally run the phone down until it shuts off (on purpose) - I have batteries that are still in good shape after many years - so I am comfortable with this procedure and I am convinced it helps to calibrate the battery/phone. I don't think it has to be done when you first get the phone, and I only do it once every few months.
Apple has some good write ups on maximizing battery life on laptops and phones.
- 07-29-2010, 11:49 AM #59
- 07-29-2010, 12:52 PM #60
- 07-29-2010, 01:54 PM #61
- 07-29-2010, 02:17 PM #62
- 07-29-2010, 04:32 PM #63
- 07-30-2010, 01:00 AM #64
- 2 Posts
@wildkarrde21 You are correct in that a battery calibration can allow for the more accurate calculation of battery life. I'm not an expert on battery technology but let me try to share with you what I know about battery calibration.
First, if battery calibrations were taking place the battery would never read 100% charge after it became worn. The whole point of a battery calibration is so the battery doesn't report the incorrect value of 100% after a full charge when it has a reduced capacity due to wear.
Second, a battery calibration is something that has to be triggered by the user, it's not something the phone will just detect and automatically start doing. Usually, as in the case of laptop computers, whenever you trigger a battery calibration it's an operation that takes full control of the laptop and is typically knowingly and actively triggered by an option in the BIOS or a separate utility. The laptop cannot be used during this process and the process can last a few hours. During the battery calibration process the laptop will completely charge and then completely discharge the battery, measuring the amount of time that it takes for either the complete charge or discharge. The thought behind this is that a battery that is worn will take less time to completely charge/discharge than if the battery were brand new (I'm not sure how charge/discharge times relate to amounts of available charge so I'm not going to even try to lie and say that a 50% worn battery charges/discharges in half the time). At this point the battery circuitry would now know the battery condition and can then use that as a baseline for battery life estimations. For example, after a battery calibration, a battery that is 50% worn would only report as 50% when fully charged, not the confusing amount of 100%.
Here's an example of what battery calibration is supposed to combat that you are all too familiar with:
Some of you may have purchased your phone on a two year contract and will probably have it next year this time. Let's assume that you take moderately good care of your battery and wear it down by ~10%. What this means is that when you fully charge the battery it will only contain 90% of the charge that it could hold when it was brand new. Say this day next year you fully drain the battery and then charge it completely, what do you think the battery charge will read? You'd be absolutely correct in saying 100%. In fact, this measurement is correct! The battery technically IS at 100% charge! Is the reading any less accurate? No. Could you improve this reading? No. Again, the battery IS at 100% capacity, it's just that the battery is worn and is only capable of holding 90% of the charge it could when new. Would a reading of 90% be more meaningful? Absolutely. A battery calibration would provide the circuitry in the battery with the means necessary to arrive at the actual 90% reading.
- 07-30-2010, 11:02 AM #65
Last night, instead of charging my phone all night, I left it off the charger. It was at 25% when I went to bed. Got up this morning and it was at 24%.
With the display off, this phone uses very little battery. I think every time I've checked my usage stats, the display takes up half to 75% of the battery used.
Anyway, I just thought it was interesting.
- 08-02-2010, 07:31 AM #66
- 08-02-2010, 10:59 PM #67
- 08-02-2010, 11:21 PM #68
- 08-02-2010, 11:35 PM #69
- 08-03-2010, 04:04 PM #70
Hm, I'm not really sure whats with all the battery issues people have been reporting. Every day I've had this phone ('cept maybe the first day?) I've only had to charge it once each night. I fully charged it the first day before ever using it. I've been messing with the GPS, syncing contacts, downloading apps, watching videos... pretty much everything you could do, practically everyday, all day. I've let it run down all the way till the phone turns off each day.
What I find pretty surprising, is that once it tells you that the batter is low and to plug it in, it will quite a bit longer than expected (like 2 hrs on less than 10%? could be wrong, haven't timed it).
I also have gtalk running and email pushing. Twitter syncing 30min. Facebook sync 1 hr. Don't know how often google syncs. I don't make a lot of phone calls so, I don't know how that will affect stuff.
I've been playing MP3s nonstop since 9:00am (now 1:00pm) and the battery is at 61%. Watched some video (short/youtube review type stuff).
As far as the comments regarding the percentage of battery the display is using? Well, duh! That's what the largest part should be. If it was a piece of software, then yeah, I'd be concerned.Samsung Captivate (Stock)
- 08-03-2010, 06:04 PM #71
Well So far getting e-mails in a low signal area *my house*, with deleting over 100 emails every morning, bluetooth calls, texting and backing up my sms messages. Almost 7 hours later and I am still at 61% which is really good.. Yes the phone did not have a very good battery life but it continues to get better. And I listen to some music, videos, browsing as well as sending e-mails. Is equal to my bold in battery life so far!
- 08-04-2010, 02:45 AM #72
Ok, this was on a 98% used battery (15h 14min)
13% Voice (just 14min and 3 sec)
8% Media Server (8hrs of mp3s)
8% Stand by
3% Double Twist
3% Android System
2% Android Live Wallpaper
Kind of worrisome is that 14 minutes used 13% of the battery. That only equates to around 106 minutes of talk time, not the 350 listed on Samsung's website.Samsung Captivate (Stock)
- 08-04-2010, 08:37 AM #73Joey
All FroYo'd and stuff...
- 08-04-2010, 12:01 PM #74
- 08-04-2010, 12:14 PM #75
lillejord - that is insane. there is no way i would be able to do that with my phone, the battery simply drains much faster than that. could all of us with really poor battery performance have bad batteries? is there any way to tell if your battery is good or bad? i need to search and see what samsung says the battery life is supposed to be with usage and on standby.