At first I was skeptical, because all the other manufacturers or sellers only batteries up to max. Offer 1,800 mAh. On well believe I ordered this battery and this now tested the fifth day. The seller has not promised too much - has this really true 2,500mAh battery and thus about 60% more power than the original 1500 mAh and about 39% more power than my last battery with 1,800 mAh. I can only praise these sellers - finally it has a managed to produce a battery for the Samsung Galaxy Ace 2, which has more power than 1500 mAh or 1800 mAh! I can only further this battery empfehlen- he really real 39% more power than the 1,800 mAh !!! Class company - iFoxtEK !!!