here I go again lost 3 flight batteries due to melt down at the connector head. all oem h520e. again dammage at the main board connector head not as bad stop early to prevent worse dammage. go figure right when I am in texas for vaction. good thing I also brought the first gen h520 so vaction not a totasl loss. well every thing was going greast untill I started using oem orange cube which charged the batteries to 4.4volts thats where the trouble hit. before then I was using third party leads at 4.35 volt charge at 5 amps no problems when I used that setting.