I don't know much about this kind of thing, so I'm hoping that someone will be able to help me out!

I have a Nokia N810 and have have it for about a year and a half. It's always been a little dodgy on the battery life, but lately it's been a lot worse! I take it off charge at 9am, turn it onto offline mode, close all applications, and don't use it the whole day, but by 7pm, it's dead... No battery power at all! And I haven't even used it!!

If I do use it, I can get about an hour out of it before it dies, if I try with the wireless it lasts about 30 minutes...

I just can't use it like this! I miss my little Nokia lasting the whole day long!!

I've tried a whole bunch of things to fix it... First off I figured it would be the battery, so a forked out and bought a new one. It increase the power by only a handful of precious minutes. After that didn't work, I reflashed it, and now have nothing installed on it besides what it came with, and it still doesn't last any longer.

On top of that, for some strange spooky reason, the clock mysteriously gains 2 hours every day The other night I was working hard (with it plugged it obviously) thinking it was 11pm... Turned out it was 1am! No wonder I was so sleepy!

But I'm getting a little off topic!

If anyone has any ideas about what could be causing this problem, then please let me know!! I'm getting a little sick of following it round the house with the power adaptor, just in case!

Any help would be greatly appreciated!!

Thanks in advance!!