... 4.rechargeable power bank 4200mAh portable external power bank for cell phone mobile phonefeatures: Battery types: polymer lithium-ion batteriesCapability: ... batteries, the equivalent of 5-6 blocks cell phone batteries for your mobile phone standby for 30 days.Durable, charge and ... / iPhone, mobile phones, the PSP, hTc, MP3, MP4, GPS, NDSL, cameras and other digital products.Plug and Play, USB ...