I'm trying to charge my MERV's 3s LiPo pack but as soon as I connect the balance lead, it gives me a "High Voltage" warning, then I tried again and it started charging the pack then after a minute I got a "Line Interruption" warning, I was just using the pack 2 days ago and it was fine , any suggestions?, I'm using a Traxxas 3s pack for the MERV, and my charger is a HP Activator 50 Multi Chemistry charger/cycler , also I got the charger from a friend and I can't seem to find a manual anywhere