Default Alcatel onetouch Star battery heats up while charging.

So, I haven't had this problem before, but the last two weeks the battery has been acting funny. Sometimes it takes ages to charge(2-3 hours), other times it charges so fast that I get a high temp warning after just 10% of charging and have to turn it off.

This started after I tried to completely discharge and then fully charge the battery, as it's recommended for li-ion batteries once a month or so.

I'm not sure what the problem may be. J could've damaged the battery, or it may be the charger.
Also, there is this curious condition: when charging, the touchscreen loses sensitivity. It handles like a very old resistive touchscreen. Only when charging. I have no idea what the cause may be here either.

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