R7
4
I bought a OXA 30000mah battery recently for use with the A4 and it’s ridiculously good. I was playing for hours and I didn’t even loose one battery LED worth of life (there are four, so not even 25%).
best price I could find for it:
http://www.ebay.com/itm/OXA-20000-30000mAh-External-Battery-for-Tablets-Netbooks-Laptops-Smart-Phones-/371082473344?pt=US_Cell_Phone_PDA_Cases&var=&hash=item56663d2f80