PowerBank Phone Co built in 2011, factory is located in Shenzhe City, PowerBank Phone is leading of Mobile phone charger, Power Bank is compatible with MP3, MP4, PSP, Samsung, HTC, Sony-Ericsson, Blackberry, Nokia, LG and other mobile phones. Power Bank lithium-ion batteries, common morphology 18650 and box shapes. 18650 is the diameter 18 mm, height 65 mm cylindrical batteries, widely used in laptop batteries. As with the universal laptop battery, now available in more than 60% of Portable Charger Power Bank use is also 18650. Currently commercialized lithium-ion batteries are basically optional layered structure of lithium cobalt oxide as the positive electrode material, the theoretical capacity of 274mAh / g, the actual capacity of about 140mAh / g, there are also reports the actual capacity has reached 155mAh / g. This higher operating voltage cathode material (average operating voltage of 3.7V), stable discharge voltage, small size, high energy, good cycle performance, high conductivity, simple production process, easy to manufacture. Advantages: mature technology, wide range of applications, compact. Drawback: at about 300 times the cycle life, low security, anti-overcharge poor, not suitable for high-rate charge and discharge, abandoned after the environment pollution. Power Bank Price: $ 28 / piece ---- Post Free Shipping Power Bank Specifications: Color: Black / White Capacity: 20000mah Input Voltage: DC 5.0V Input Current: 1.0A (Max) 2 USB Port output charging 2 devices simultaneously Output Voltage (Port 1): 5.0V Output Current (Port 1): 1.0A Output Voltage (Port 2): 5.0V Output Current (Port 2): 2.1A LED indication for Battery Status Power Bank Features: Power Bank 20000mah external backup battery for iPhone 3G,3GS,4G,4GS, iPod, iPad1, iPad2 and mobile phones. Be compatible with MP3, MP4, PSP, Samsung, HTC, Sony-Ericsson, Blackberry, Nokia, LG and other mobile phones. Built-in 20000mah high capacity rechargeable battery. High efficiency of power conversion. Electricity-saving function. Portable, practical and long cycle life. Safe and reliable, perfect for using on travelling and outdoor activities. Package Included: 1 x Power Bank 1 x USB Cable 8 x Adapters 1 x Box Retail Package More details please visit www.powerbankphone.com