Uploaded new STL files. The model was modified a bit to reinforce some thin walls that may break off.
After making the first version of the charger - http://www.thingiverse.com/thing:2029280 - I thought it was unnecessarily bulky. I redesigned it resemble the shape of the batteries so it'll fit in the battery compartment of the Solo backpack.
18 gauge output wires are routed and held in place by built in clips. The converter is secured with 2.5 x 6 mm screws. The fan is a 25 x 25 x 10 mm unit connected to the converter. Got it from Amazon - https://www.amazon.com/gp/product/B00MYNWUP4
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