I'm aware there are many threads regarding battery life issues already, but it doesn't seem like problem has been isolated and described properly by someone (ie. in wiki) yet - however, I'd genuinely love to be wrong here.

I have N810 flashed with latest OS2008 for over a month now, and its battery is really driving me nuts. I'm checking battery charge level with battery-status package. Sometimes it's quite all right, and battery discharges itself slowly when on standby, with wifi/BT on. Sometimes, while on standby AND in offline mode, it drops overnight from 80% down to 5% without any obvious reason. Sometimes when battery charge level is - for example - 50%, and I reboot my Tablet, it jumps to 90% after reboot. Sometimes it drops to 20% after reboot. Totally unpredictable.

I've tried isolate the problem - first off by disabling metalayer-crawler, as advised by someone on the forum. Then I've spotted that Modest sometimes leaves running processes in the background (ps aux | grep modest), despite closing it. But battery still discharges quickly without any regular pattern, even when no applications appear to run in the background.

The very latest example was today at work: I've disconnected N810 from charger at home around 7:30am. At 10am in the office battery was 94%, but I've been using tablet on my way to work, so that's ok. When I was leaving office at 6pm it was... 47%. During that 8 hours device was mostly idle, I've just checked software updates in Application Manager once and that's it! I've even made sure that Modest didn't leave any processes in memory, and closed off all apps as I arrived to the office. When I did reboot battery level dropped to 10%. Insane!

Did anyone worked that issue out?