The best replacement at this time is P-B-10400-24-S02-RB PowerPack Four USB Ports silver. Sleek innovative and packing a power punch the PowerPack AD Series rechargeable batteries extend the life of your smartphone or tablet. The included micro-USB cable plugs in to keep your devices charged and also lets you easily recharge your PowerPack. iPhone users have the benefit of using their existing Apple charging cable for connection to the PowerPack. The AD Series also doubles as a lashlight featuring a built-in LED light especially useful in emergency situations.