don"t buy SONY BRAND 2100 and 2500 mAH sayang lang pera, I bought 20 pcs last year sa showrrom ng sony mismo, ang bilis ng discharge niya 2-3 days lang w/o using discharge na agad, last week nag email ako sa sony to complain nag reply namn sila agad next day requesting me to submit what model ng battery, date of purchase and name of dealer for them to investigate DAW, nag reply naman agad ako with scan copy of receipt, after that wala na silang reply , nainis ako binalik ko lahat ng binili ko sa kanila thru courier , 8 pcs naka sealed pa, attn: ko sa president, sad to say lampas na 1 week wala pa rin feedback , try ENELOOP brand so far ok naman