My 2 cents. Charge at rates over 10 amp, and probably forget any warranty. Any issues with balance / bad Resistance, I would not push that battery any more. Charge at 10 amp and use for practice. Just a price to pay for pushing the limits. If anything, I would at least charge / discharge in a lipo bag, anything over 10 amp.

Gotta love RCTECH, start a thread to ask a question and get responses about everything except the question.

I don’t need advice on what everyone thinks other people should charge at or about properly handling batteries. Thanks anyway.

You asked what you needed to do to this battery to get it in shape. "Stop abusing it at such high charge rates" while it's in this state is a perfectly valid response.

+1 well put giga.. abusing totally agree..

op you where given what to do's in posts 2-8 you chose not to agree or follow any advice that would make sense to people who charge less than 8C..

Have you measured the voltages of the individual cells after discharge? Could be you're over discharging the one cell and that's why it's way off.

I don't think the iCharger measures individual cell voltages when discharging. Would be a nice feature and one that I use in my own Arduino based discharger. I monitor both cells and when either one of them gets to the cutoff voltage it stops. I think the iCharger like most other chargers when you say 3.5v/cell, just multiples this number by the number of cells and cuts off when the pack voltage reaches that number.

The 406duo has an option to balance as it discharges. Also, the fast balance setting on an iCharger doesn't hurt anything.

As for everyone that says high current discharging and charging is bad for the battery you are flat out wrong. I got an entire year out of my last battery doing 11C discharging and 10C charging. I know people keep batteries longer than that, but in terms of pure performance after a year a battery is done. If you don't push a battery, you don't really notice the drop in performance as they pass the year mark.

The chemicals in a battery can do a certain number of cycles before they lose capacity, and increase internal resistance. When you push batteries hard you need to pay close attention to what the cells are doing. The numbers don't lie.

The batteries in question are rated for up to 10C charge rate, however the manufacturer does recommend 1C to increase the lifespan. Though you should only use the higher rates if the pack is healthy. This one is suspect.