Only enthusiasm, then disillusionment. Overheated and leaked battery

To feed my S4 Mini with a more powerful or replacement battery, I have opted for the well-rated battery from the house of Mumbi. I was several months really pleased that battery power was felt better than with the original battery. Unfortunately, the battery is overheating despite using the original charger on vacation and easily leaked, so my phone since adduced disorders. Samsung refused to repair because I used no original battery. I hope I'm just affected by a faulty design. Become nevertheless future second battery can be left out.