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What do you guys think about these batteries as external backup?
2x 4000mAh 18650 Protected Li-ion Rechargeable Battery:
http://cgi.ebay.com/2x-4000mAh-18650-Protected-Li-ion-Rechargeable-Battery-/170648528884?pt=AU_Electronics_Batteries_Chargers&hash=item27bb71e7f4
Firefox 9.6V 4000mAh Ni-MH Airsoft Large Type Battery:
http://cgi.ebay.com/Firefox-9-6V-4000mAh-Ni-MH-Airsoft-Large-Type-Battery-/120731548609?pt=LH_DefaultDomain_0&hash=item1c1c293bc1
They are not large, cheap and will give you an extra 4000 mAh
2x 4000mAh 18650 Protected Li-ion Rechargeable Battery:
http://cgi.ebay.com/2x-4000mAh-18650-Protected-Li-ion-Rechargeable-Battery-/170648528884?pt=AU_Electronics_Batteries_Chargers&hash=item27bb71e7f4
Firefox 9.6V 4000mAh Ni-MH Airsoft Large Type Battery:
http://cgi.ebay.com/Firefox-9-6V-4000mAh-Ni-MH-Airsoft-Large-Type-Battery-/120731548609?pt=LH_DefaultDomain_0&hash=item1c1c293bc1
They are not large, cheap and will give you an extra 4000 mAh
