[XPERIA X10 General] Acronyc84:
I thought since I've found a lot of useful information here, I'd post my experiences with the X10. I have the Japanese version, with 1.5 firmware, 1.0.09 baseband and build number R1EA018.

When I first got this phone, battery life was terrible. The first few days I couldn't get more than 6-8 hours of it with light usage. It's gotten better over time, but I still can only get about 12 hours of day with light to medium usage. I've had the phone for two weeks this Sunday, and I think it should be better than that by now. Last week I found this forum and have tried numerous things to increase the battery life, with mixed results.

First, my settings. I have Timescape set to manual update, Google, Facebook and Mixi (Japanese social site) are also all set to manual. I don't have a Moxier account set up and basically nothing automatically updates except email (every 10 minutes), with all syncing done manually. I have wifi and bluetooth off and no location services are on (gears is off in the browser as well). I don't have any weather apps or anything else pulling in data. I do have my data connection enabled, because without it I can't access the internet, and what's the point of having a smartphone without internet access. I've switched my network between WCDMA only and GSM/WCDMA preferred, but since my carrier in Japan doesn't have GSM and only uses WCDMA, I'm not sure if this makes a difference. I use a task killer program to kill Moxier Mail, as it is always on even though I never set it up or touched it. It always comes back without fail even after I kill it.

Anyway, with the above settings I'm getting about 12 hours use on average, with light use. As an example, this morning I left and took i off the charger with 100%. I went to the station around 10:00am, and the trains were running really late so I had to make a bunch of calls and send a lot of emails. I used it for about an hour with calls and emails and it dropped to 83%. It was in standby until 1:00pm and it dropped to 69% at this time. Between then and 8:00pm, I used it to send a few emails and browse a few sites. Probably no more than an hour in total, and it dropped to 32%. I didn't listen to any music, watch any videos, sync anything, or use bluetooth or wifi during this time. Basically two hours of calls, emails and browsing with five hours of standby dropped it 68%. This seems awful quick to me, and if I use it for anything else like listening to music I imagine this will drop quicker.

The strange thing is, I get very mixed results. Between 7-8pm it only dropped 1% in standby. But while I was coming back from a meeting and writing an email, it dropped from 42% to 37% and then five minutes later from 37% to 32% at once. A 10% drop in five minutes is way too much and my phone doesn't seem to drop by single digits.

After reading this forum two days ago, I decided to do a factory reset. I charged it, did a factory reset, didn't install anything, left all syncing off except email and left it on standby when I went to bed. Six hours later, I checked it and it was only at 97%. I was very happy and I thought the factory reset had fixed it. It lasted the rest of the day until 1:00am that night, for a total of 20 hours. I didn't have heavy usage, but nothing different than today's use.

However, today it went back to being the way it was before, with it dropping 68% in 9 hours, which is on track to give me 12 hours. I wouldn't mind 12 hours, but I'm not doing much with this phone. I just make a few calls, send some emails and browse the web for a total of 1-2 hours use a day, and this is all it lasts. If I want to use it for all of its useful functions, which is why I got it in the first place, I'll be lucky to get 6 hours.

About Moxier, I'm not sure if having it off really makes a difference. I've tried tests with it on and off, and sometimes my battery is significantly better with it off and sometimes there's no change. It seems weird SE would include it to always be on if it drains so much battery.

Anyway, besides the battery issue, I love this phone. It's my first smartphone and it's awesome to have so many things available. I just wish I could use all of its features without worrying that the battery will run out in five hours! I'm going to give it another week or so to see if my battery gets any better, but so far the factory reset only helped for one day and I'm thinking maybe I have a bad battery. If its not, I'm hoping SE can fix this in an update if they ever get around to it.