MiPow SP2600M-BK Power Tube 2600 mobile spare battery with Micro-USB adapter for mobile / smartphone / MP3 player / Navigation devices / PSP / NDS / Wii U black (Accessories)
The first product, what I got was delivered apparently defective. Sometimes charging may not launched, sometimes. However, the exchange was at Amazon no problem at all and I got an immediate replacement. With this product, I now have no problems at a