Do the external battery chargers hurt phones?

I've had two phones now that died similar deaths and both had a pair of batteries and a wall charger. I'd pull the battery at the beginning of each day and put the fresh charged battery in. Both phones (S2 and an S4) just boot looped and got hot without anything further. Could the external charger and swapping the battery each day have hurt the phone? I did this because my first android phone had a bad usb port.

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