i dont trust online claims. Meaning buying for a non official or authorised seller.. e.g hardwarezone.com or yahoo auctions. Their price is really sheap but their life span is less than 6 months before you start to notice the fast discharge rate. I bought 4AA 2500 sanyos online, less than 6 months their discharge rate is twice faster than the original in the box with charger. Furthermore i'm using those discharge charger types. I always discharge then recharge. I use them for my other hobby, flying helis. So batteries are very important.