iPhone 3GS with fw 3.1 – battery life gets even worse

What I'd do, is restore the phone and use it for a while with NO third party apps at all to see if one of those is a problem.

I wouldn't trust these low posts noobs bashing the iPhone's battery life. My upgrade went smooth with no problem what so ever.

the upgrade of 3.1 fixed my problem on the fast draining battery. then my iphone with 100% fully charged only last for 5 hours during standby (no calls, text, wifi). i tried doing reset and restore 3 times.

after downloading itunes 9 and upgrading to 3.1 my iphone which i left at 100% last night and woke up 6:30 the battery is at 99%. now at 1pm the battery is at 75%. I made calls, use wifi, facebook, emails and listen to music. everything was left on......... push notification, email and wifi. apple must have fixed all the bugs on some applications.

Can someone explain why my posts disappeared?

My last post (which is now missing) stated that I read on another thread that this my be caused by email push, Exchange in particular. I fall into this category, does anyone else?

So I've been thinking about this. Immediately after I upgraded to 3.0.1, my battery life was freaky. After installing 3.0.1, I charged it fully and went around with my business. I don't use the phone much, and it is in airplane mode most of the time (due to no reception in my office). For the first 3 days of the week, I was losing a few percent per day. Then on the 4th day, it dropped from 77% to 39% in one day. Just for kicks, I let it run to shut off before recharging. After recharging, battery life is fine, and appears fairly linear again.

Is it possible that the battery calibration information gets reset when we update/upgrade the iphone firmware? If so, it might explain the wide variation and wacky results. Since 3.1 just came out, has anyone with issues tried doing a full discharge/charge cycle before making battery life comparisons? Apple recommends doing this one/month anyway - and it might be worth a shot.

I'll be running my phone flat again the next time I have battery issues, (which isn't often). Worked for me last time.

I performed the 3.1 fw upgrade last night, did a full charge on my iPhone and went to bed. When I picked it up before heading out the door this morning, I saw that the battery was down to 44%, and had 2 hours of reported usage. In the few hours since, it's gone down to 17%.

Pre-upgrade, I was getting three or four days of standby time.

I expect the act of applying a new firmware means the battery sensor gets reset and so it's like a new iPhone again, you need to use it a bit to get maximum battery life.

dty wrote:
I performed the 3.1 fw upgrade last night, did a full charge on my iPhone and went to bed. When I picked it up before heading out the door this morning, I saw that the battery was down to 44%, and had 2 hours of reported usage. In the few hours since, it's gone down to 17%.

Pre-upgrade, I was getting three or four days of standby time.

Did you fully discharge it AFTER the upgrade but BEFORE the full recharge? It might also be worth doing a reset before the recharge as well - to make sure there aren't any rogue apps running in the background.

No, I did not do a full discharge after the upgrade. I was down to about 40% before I started the upgrade, so I just left it plugged in to complete the recharge after the upgrade completed.

I did notice that my push notification settings were changed after the upgrade. Charging now, and turned off push notifications. We'll see if it behaves better after this charge cycle.

I, too, noticed that once, right after upgrading I turned on my phone and it was way way low on battery, I had left it full.

I let it run all the way down, charged, and it's back to even better than before.

I had no battery issues at all (massive use of wifi and calls and always get a full 24 hours) - until I upgraded to 3.1.

I dropped 70% in 3 hours with only 10 mins of calls.

I've now done a reset and recharging to full and will try again but it doesn't look good.

M

I'm happy to report that after my second full charge, and after I reset my Mail and Calendar settings to not use push notifications, my battery life seems to have stabilized considerably. Still at 99% after almost four hours of standby.