dezfan,

My whole point is that the constant C rate does not mean anything. Some manufacturers test loose cells in a pack and then rate the pack based on the loose cells. Some test with 5 awg wire that is an inch long soldered directly to the tabs of the cells. Some consider it a constant rating if it lasts more than 10 seconds at over 3V. Some allow temps of 160 degrees. Some use cooling over the cells. Some test the cells starting at 50 degrees. THERE IS NO STANDARD.

Brian,

You can tell us your opinion of what the standard should be, but no matter how much influence you think you have, all the manufacturers are not going to "conform" to your standards.

You stating what you think the standard should be will not make it the standard. Thinking that your standards are the "standard" is crazy.

I have struggled with this whole C rating thing ever since the beginning when I would get a 20C cell from 2 different manufacturers and the performance would be completely different from one to the other.

That is the reason that we are changing it. At least this way I can feel like we can honestly back up our claims based on anyones "standards".

As an example, I have talked with a customer who thought that the standard should be "Constant C rate should keep the pack under 100 degrees, over 3.5V and should deliver the full rated capacity". I can not argue the point since there is no standard.

All we can do is tell you what the rating is, how we got to the rating, and how to determine what motor to use the battery with. If you smoke our pack on a motor that has a surge watt rating lower than our packs surge watt rating, we will replace the pack under warranty. It is that simple.

-Austin