Help New Battery, Factory Reset - still battery drain

[The_D]

I have got a strange problem.
My Samsung S5830i Galaxy Ace has a battery drain of 50% in one night without usage, WLAN off.

The device is rooted, and I've had an battery issue when using Link2sd with a ext2 partition (bcm.sdhc3 kept the phone awake all time). I fixed it using ext3. This was six month ago, no problems again.

Since last week, I got this huge battery drain. BetterBatteryStats tells me the phone is sleeping most of the time, no suspicious processes.

I tried with a battery from a friend, no result.
I factory-reset my phone, no result.
I used a ClockworkMod recovery from the time before link2sd, no result.

The battery is still draining like hell.
What else could I do instead of throwing the phone away? Please help!

 

[Rukbat]

That depends on what's using the battery - which you haven't told us. If there's no software using it, and it's still draining, there's a hardware problem (like a component drawing a lot more current than it's designed to).