I bought a Polarcell 1800mAH battery two weeks ago.What can i say ;
Battery drain is slow at multitasking,gaming,surfing etc.But at standby,it's nearly to org.1500mAH battery.(I think android OS and android system causing it)
Long story short get it
if i wrote a long sentence,sorry for my bad english mates!
Edit :For an example.Yesterday morning i took away my phone from charger(2.3.6 jw4 installed) and between 08:00 Am to 11:00 Am, i played games.(completely!,no pause or exit at all) when the afternoon i listened music like 30 mins.
Then again between 02:00PM to 05:00PM watched films etc.
When it was 06:00PM,my battery was at %49.
Hope it was helpful mate