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Yes you can. However if the external battery pack is drained, it will take a while to fully charge battery to full again. Unfortunately I have not measure the time to fully charge from depletion yet so I can't tell you the time. Also this varies with the battery pack size you have. So unless you plan to drive for a long time, you may have to take the battery out and charge it overnight in the house.
I just read external battery packs have a running temperature range and storage temp range. For ravPower battery that I have, it has a running temperature of 0C to 40C and and storage temp of -20C to 60C so those temps aren't that high for the summer heat. Like others side, you don't the battery to explore in the car.
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