Petition for battery testing standards!

[brushlessboy16]

Originally Posted by snellemin

76 degrees is silly. I want to see 100 degrees data, real world environments.

edited.

[zeropointbug]

Why not just a label that states the packs Ri, that will tell us most of what we need to know right there in one simple number, much better than a C rating obviously.

EDIT: and a simple discharge curve at various C rates, with clear defined grid zoomed in on the graph lines.

Also a C rating should be really based on temperature though, it should be a predefined average voltage under load. Because some cells are different dimensions, which would for a given temp, one pack might have a higher/lower voltage under load because of a different heat dissipation level (cooling area)

[BrianG]

Originally Posted by zeropointbug

Why not just a label that states the packs Ri, that will tell us most of what we need to know right there in one simple number, much better than a C rating obviously...

Trouble with stating a single resistance number is that it is not constant. It is a curve which is a function of discharge rate and temperature. The label would have to show a graph, or at least provide the range of Ri vs temperature and discharge rate.

[zeropointbug]

Originally Posted by BrianG

Trouble with stating a single resistance number is that it is not constant. It is a curve which is a function of discharge rate and temperature. The label would have to show a graph, or at least provide the range of Ri vs temperature and discharge rate.

Yah, good point, but all you would need is a temperature controlled testing, as one who would test them would most likely have. I don't really know what kind method Hyperion uses to calculate their packs Ri, but they say my 3s 4200 packs have 4mOhm, and the 720i NET reads between 4-5mOhm, and my other last gen. Hyperion VX Enerland 6s packs read 23mOhm, or 11.5mOhm per 3s.