Yeah, i lost my stock battery (NH-10WM) and bought one(NH-14WM), but found the stock battery (NH-10WM) weeks after losing it. But... The NH-14WM is bloody good. Depending on usage, i could get it up to one week without recharging commuting and using it durring school hours. So its pretty good! ITS A GOOD GO TO USE The NH-14WM! YOU GET MORE HOURS!