(near Stockholm) It is extremely likely that there are two Lithium 18650 standard cells in the GPS tracker.
They have a higher energy density than flat polymer batteries based on LiIo.
Luckily, my GPS trackers are a bit older, so I can’t open them destructively.
And, of course 😅, I have separate charging electronics for 3.6 volt lithium batteries with me.
Tralla…
So re-solder, charge and re-solder again. Then assemble everything.
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