Quote:
Originally Posted by kulangflow
I tested 5s2p a123 in my stock 3905 E-maxx. I used a method learned from tiran_rw on the Traxxas forums to manipulate the data like this:
-Sorted the Amps (ascending)
-Dropped the digits after the decimal (forced round down)
-All the voltage points that have the same current get averaged into one sample for that amperage point. (eg anytime 15.00 - 15.99 amps occurred, add all the voltages together, and divided by how many occurrences)
This is what I came up with.
10C - 46A - 14.42V - 0.82V / cell drop
15C - 69A - 13.55 - 0.99V / cell drop
20C - 92A - 13.13V - 1.07V / cell drop
25C - 115A - 12.73V - 1.15V / cell drop
So, what would you say a correct rating for these cells are?
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That graph looks pretty unpleasant to me. At 10C, they're already under 3V/cell and at 20C, they're under 2.7V/cell. This would lead me to believe that either you have some bad cells or A123 was smoking crack with their 30C rating. Sure, they may be able to be discharged at 30C, but the voltage drop is horrendous.