The original and standard battery that came with my Samsung D900 seems to have limited capacity in terms of call & standby time. Not too bad but I really want something better. There are several suppliers on ebay of 'extended' 1000 mAh batteries but none of them are Samsung branded. Has anyone else bought these Chinese mfr'd batteries and found any problems with them. I know they're not very much money - you can buy one for for under a fiver BUT do they work as advertised? Any recommendations would be appreciated.