Rivapower Li-polymer Portable Rechargeable Battery, 4000mah, WhiteThis slim, lightweight 4000mah rechargeable battery is perfect for travellers to charge their mobile electronic device in any situation. The compact and stylish battery design makes it convenient to carry it in your bag or pocket. It can charge smartphones such as a iphone up to two times, or tablets up to one time (depending on the device battery capacity). To check the battery status, tap the battery body and four led indicators will show the