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I watched 8 hours of streamed video via 3G on this, still had charge at the end too.
http://www.ebay.co.uk/itm/4200mAh-External-Battery-Backup-Charger-Case-Pack-Power-Bank-For-iPhone-5-5S-5C-/171350267314?pt=UK_MobilePhones_MobilePhonesCasesPouches&var=&hash=item27e54595b2
A quick google suggests the kinematic viscosity of:
VPower = 0.5-0.75mm2/s at 40°C
BP = 0.5 to 0.75 mm2/s at 20°C
I was expecting (if anything) this to suggest that Vpower might be less viscous and more prone to leaking / pressure loss. If these figures are correct it would suggest the...