Home-brew battery measuring station

[BrianG]

A little off-topic, but this sort of drives home the need for a standardized testing and rating.

I was taking some ET graphs of a couple of vehicles and the test results are quite revealing.

First up is my CRT.5. Castle ESC, Medusa 36-50-3300, 46/14 running on an Elite 3s 30C 3.3Ah battery. Here is a screenshot of the run:



Next up is my Slash. HobbyWing 80A ESC, Medusa 36-50-2200, 58/11 running on a Maxamps 4s1p 5Ah 20C battery. Here is the screenshot of that run:



All I gotta say is WOW! The Elite held 3.4v/cell at a 149A burst!!! And the average voltage is pretty darn good too! OK, it IS rated for 30C after all, so let's look at the MA pack. The highest burst is 61A, (which is 12.2C by the way) and the voltage fell to 3.12v/cell.

Of course this "test" is not repeatable, nor does it show anything conclusive, but there is a definite discrepancy here.