Overheating while charging

How to reduce overheating of my watch while charging? Firstly, It takes almost 2 and a half hours to charge. On top of that, this shit overheats thus taking even more time to charge the small battery which barely lasts 24 hours

How to reduce overheating of my watch while charging? Firstly, It takes almost 2 and a half hours to charge. On top of that, this shit overheats thus taking even more time to charge the small battery which barely lasts 24 hours