“PowerBlock Reserves for iPhone or iPod” is introduced by Griffin. PowerBlock Reserves looks like your another battery, a removable Reserve battery pack. while you are charging internal battery of your iPhone or iPod, at the same time its recharge the removable Reserve battery pack.
PowerBlock is AC charger/adapter for USB-rechargeable devices, including iPhone, iPod, and other phones and MP3 players. PowerBlock works in almost any AC wall socket, with electrical service from 100 to 240 volts, and delivers safe power level for iPhone, iPod, MP3 players and other USB devices. Take the removable battery pack with you (its small to fit in your pocket). The Reserve battery snaps into your iPhone’s or iPod Dock Connector, adding hours of additional time on your iPod or iPhone. Best Selling Product PowerBlock Reserves priced at $40.