Ram008

I believe the polarity of the Parkzone balance lead pins vs. the Thunder Power pins are reversed. I would suggest using a voltmeter and checking the polarity of the pins on the Parkzone and Thunder Power packs to confirm. There are 4 pins on the balance plugs and putting a voltmeter across any 2 pins that are next to each other will give you the voltage of a cell. Just check the same pins on each plug and it will tell you whether the polarity is reversed.