RCM Lipo impressions

[BrianG]

I must have missed your response JT. Yeah, a car amp heatsink would work, but still not nearly big enough for 1850w. Even a large 1000w rms car amp only has to dissipate ~600w (class AB amps are around 60% efficient), which is one third the power that I would need to. And amps don't run at their max power constantly, unless you like listening to sine waves, so actually it is dissipating probably around 200-300w. So, I would definitely need a really big sink AND fan setup for this!

Anyway, I played around with Mike's new lipos today. I ran down a pack to LVC. Let me tell you, they dump quick! One second you have full power, the next you're done. Usually, if you let the pack sit for about 10 seconds and try to move again, it will have enough oomph to get the vehicle back to you. Not these. When they're done, they're done. Period.

I put the pack on the charger and it was right at 15.1v still after about 5 minutes. Not much rebound (good!). As soon as I started the charge, the voltage increases quickly. I only put about 400mAh before the pack was at 18.5v. The voltage increases slowly from there to CC/CV. So, the discharge/charge curve for these cells are really flat! And the cells stay within ~.08v of each other at any time so far. So, as you can see, I have nothing but praise for these so far.