iphone external battery for iphone 4/4S

* Capacity: 1000mAh
 * Size: 6.1 * 5.2 * 1.2 cm
 * Weight: 40G
 * Battery type: Lithium-ion battery
 * Rated input: 5V 800 mAh
 * Rated output: 5V 500 mAh
 * Static power consumption: less than 100uA
 * Operating temperature: -10 ℃ - 45 ℃
 * Charging time: about 2 hours
 * Large capacity, up to 1000mAh, so double the iphone battery life
 * Press the test switch to TEST, the perfect triangle led lights show remaining capacity
 * In any state, can be charged, plug and play
 * Use high-quality environmentally friendly lithium-ion batteries, charge and discharge capacity of 500 cycles more than 80%
 * Smart protection chip: over charge protection, over discharge protection, overload protection, short circuit protection
 * for Apple products iPhone3G/3GS/4G iPod ....