I bought this as a spare battery to a TAIYO RC car (not WLToys as in your descrition). I measured the polarity and voltage of the battery and it was according to your description. When I connected the battery the cables in the car got warm and the plastic insultaion on the cables started to melt. I measured the battery once again and everything were ok. I changed the damaged cables in the car, connected the original battery and everything worked good. After this I connected the new battery once again, and the same problem occured with cables that got warm and cable insultation melted. I can not understand what's the problem with this battery. The volatage of the new battery is lower (6,4 V) than the original (7,4 V), but this should not be the problem, or?
Good product quick delivery. thanks