TP4056 Heating While in Use
The TP4056 is a complete constant-current/constant-voltage linear charger for single cell  lithium-ion batteries. 

This means it can charge up to the input voltage or 4.2V whichever is smaller.

But Vin is rated at 4V min which is still ok for LiPo charging.

But using a lower supply like 3.7V means the internal FET does not have as low a Ron switch resistance so I^2Ron power will make it hotter.

However my specs indicate 15k will not suit 0.24A rather only &lt;130mA ( off scale)

5k for 250mA should be ok.