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For NiCad/NiMH, this is about 1.2V, for lead acid it is 2.0V, and for lithium cells it is on the order of 3.7V
What do you sacrifice by opting for a waist pack like the Osprey Seral 4
Most backpacks with USB ports work the same - there is a special pocket on the inside of the backpack that holds a portable power bank (usually sold separately) with a USB wire that leads to an external USB port
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