OMG, dejavu it's like my Desire days. AVOID E-CELL LIKE THE PLAGUE! They screw their customers randomly to avoid constant negative feedback, this is for casings and other phone accessories.
All their batteries are fake, I'm surprised nobody hasn't sued them yet in the UK. Tear off that cheap golden wrapper and you can probably see the real capacity and most are made in china and not Japan like they claim. It's like they're repackaging those Chinese $2 batteries and label it high capacity.
ALWAYS ALWAYS AVOID E-CELL.
Probably they have learn their lesson, the new batch of batteries only have the golden sticker ontop, no sticker below (just blank battery). Measured this battery using app 'battery monitor widget pro' with full charge then drain and recharge. Seem like not all battery is build the same, I have 2 (1st one i tested and confirm NO way better than stock,and lodge a complain & they sent a second battery). Did the same to measure and 2nd one comes around 2000mAH.
For me, its like extra battery (don't expect good stuff comes cheaply, if you want a battery that last get mugen, got that and it DOES LAST, only complain is the SIZE of that back cover..... its bulky)