Long term (4 year) A123 26650 findings.

[BrianG]

Glad to hear it.

I'm interested in those 10Ah prismatic A123 cells as well. I want to build an ebike or something and those look like they offer the best capacity to volume ratio (due to their packaging). Plenty of juice for going back and forth to work, and then some without needing to charge there.

[zeropointbug]

Yeah, and they should be around 150Wh/kg. I would like to see some Headway cycle life data, just to compare.

I just froze the pack down to -25C (-13F), did a discharge on the 720i, reported 148mOhm off the start, then just decreased from there until the end of discharge of 64mOhm.

Will post a heated test of 165F once I'm done.

EDIT: Finished the heated discharge, pack temp was 167F when I started the test, discharge function on 720i, cell iR went down to 28mOhm/5 = 5.6mOhm/cell.