We made several “under the hood” upgrades to the USB Battery Pack V11 in this production run. One of the most important was the use of high-temperature Lithium-Polymer cells.
In the test, the cells were heated to 130 Celsius (266 Fahrenheit) and were stored at 80 Celsius (176 Fahrenheit) for four hours. In neither case was there any damage to the cell nor significant loss of capacity. Storing and charging the battery at high temperatures will diminish the capacity faster than storing at normal temperatures, but less than if we were using normal Lithium Polymer cells. We recommend venting the bag or case (leaving the zipper open) to reduce temperatures while charging our battery or any device and storing the battery between -20 and 35 Celsius (-4 to 95 Fahrenheit).

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