Bought 2 of these, used them on a shoot, don't need them anymore. I sold one. Used to power a BMCC and an EVF. You can power any camera with 12/16/19V and the right cable.
Tiny marks and scratches on bottom where they were mounted in a custom cradle. Have not been dropped or abused. The battery work flawlessly.

Asking £50
More info here:
http://www.ianker.com/product/79AN20L-SA
Capacity 20000mAh
Output USB output: 5V, 2A; DC output: 12V / 16V / 19V, 2A
Input 5-19V / 1.3A
Weight 562 ± 10g / 19.8 ± 0.4oz
Size 185 × 125 × 15.5mm / 7.2 x 4.9 x 0.6in
- See more at: http://www.ianker.com/product/79AN20L-SA#sthash.f9bKqrR3.dpuf
Can power your EVF or monitor as well.
Lasted about 4 hours combined record and standby mode.
London, UK based seller, Cash on collection preferred or add 4% for paypal if paying via paypal.
Tiny marks and scratches on bottom where they were mounted in a custom cradle. Have not been dropped or abused. The battery work flawlessly.

Asking £50
More info here:
http://www.ianker.com/product/79AN20L-SA
Capacity 20000mAh
Output USB output: 5V, 2A; DC output: 12V / 16V / 19V, 2A
Input 5-19V / 1.3A
Weight 562 ± 10g / 19.8 ± 0.4oz
Size 185 × 125 × 15.5mm / 7.2 x 4.9 x 0.6in
- See more at: http://www.ianker.com/product/79AN20L-SA#sthash.f9bKqrR3.dpuf
Can power your EVF or monitor as well.
Lasted about 4 hours combined record and standby mode.
London, UK based seller, Cash on collection preferred or add 4% for paypal if paying via paypal.