No problem with current day batteries. When they're full, the charger will switch off or switch to drip charging. It won't overcharge. Except, when you use a grossly flawed charger. However any USB-charger of any phone manufacturer will do nicely. I've charged my Kindle using a Motorola and an LG Nexus charger, my aunt uses her HTC one, and a friend of mine uses a Samsung one. Only difference may be charging speed.
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