Sorry for taking the mickey that was out of order.
I appreciate that you are trying to post and help the original poster.
But i'm sure even trakpower would not recommend using a battery outside of it's spec.
The c rating is there so that a motor and esc combo can be chosen that does not exceed that c rating.
A lipo rated at 87.5A would likely be able to deliver 100A but it would degrade(possibly damage) the battery much faster probably. There is always the possibility that the manufacturer air's on the side of caution when giving a c rating.
There is no exact science to it because of tolerances and differences in battery's.
Just keep the c rating of the battery above that of the motor/esc combo.
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