I bought a refurbished hotspot device and it soon ended up just not being able to charge fully. And if so, then it had to be charged at night. I found this charger that is special for my device. Now a full charge only takes a few hours. Also, it didn't change color from red to green with the old charger, so I had to keep unplugging it to check if it was fully charged. This thread also solved this problem.
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