There is this battery from Digipower which is a rehargeable NiMH battery Pack which supposedly gives up to 4x what a normal EN-EL1 provides. It's a sealed battery pack of 4xAA, and comes with its own charger and leather pouch and belt clip. It connects to the Coolpix/DC by the AC socket. If you surf the foreign mail order websites these are pretty cheap (~US$30). As for singapore, not too sure but I heard that Ruby sell these. I am certain that the camera section at IMM's Giant has it, for a slightly higher price (S$120). I bought one not too long ago, and it seems to be working as advertised.