Originally Posted by DIYguy
It seems that they guys who have had the most trouble with the RC cells are the ones that pushed them too close to their max Crate without some pack "overbuild". These ones tend to cause greater imbalances and can even cause thermal runaway. (a fire you can't put out).
Sorry if I didn't read all your specs. . . but if you test current level are anything close to your racing current levels, that seem like a very comfortable margin. Maybe even more than you need. I would ask Steve about this also. John Metric has had some good success with keeping the Crate lower. I know Olley just burned Black Current 111 to the ground with Flight power cells. This sounded like thermal runaway, not the balance wires issue he had last year.
My racing current levels will be a bit more extreme, but there is still quite a bit of head room. The current the motor will see is 400amps thus the batteries will see a bit less, lets say that they saw the full 400amps then they would be at 13.33C a level that I am quite comfortable with. I have emailed with Steve, and he was comfortable with these levels. The "bricks" are rated to 35C constant under RC conditions and I am well under half their rating at my max current.
As for BMS as you had previously brought up, I looked into different types and almost bought one but after talking with Steve he just runs Methods HVC/LVC on pretty much all his lipo, with the controller cutting voltage at 3.5v which is what I plan on doing. I will have plenty of hardware with me at the track for checking and balancing cells if it needed.
I appreciate you looking in on the build, and encouraging me to seek the expertise of others.