18650batterystore Eve LF280K grade A test results

[niktak11]

I finally got around to doing a capacity test on one of my 18650batterystore grade A Eve cells that I received earlier this year. I removed this cell from one of my mason 280 kits that had 77 cycles (as reported by the seplos BMS).

Test method:
Charge to 3.62V with 40A, 5A cutoff
Discharge to 2.52A with 40A

 

[niktak11]

I'm also running a capacity test on a brand new cell that I accidentally overcharged to 4.1V once (whoops)

 

[niktak11]

The results of the new cell that I accidentally overcharged once. This time I did the full 3.65->2.5V.

 

[niktak11]

Bonus cell test:
This is a ~9 year old 180Ah cell that lived its first few years in an EV truck (~330 cycles according to the guy I bought them from). Then they've sat outside on my back deck in a box mostly since then. I'm finally about to use 8 of them for a portable hand truck build. 92% of original spec is pretty damn impressive imo.

 

[RV10flyer]

I finally got around to doing a capacity test on one of my 18650batterystore grade A Eve cells that I received earlier this year. I removed this cell from one of my mason 280 kits that had 77 cycles (as reported by the seplos BMS).

Test method:
Charge to 3.62V with 40A, 5A cutoff
Discharge to 2.52A with 40A

I never test or top balance. Hook 16 of the 304’s up and JK just works. They are better than any I purchased on Aliblabla, although Amy’s at SLT were almost as good. New solar gurus should save their money on a load tester, mine is gathering dust. No way was I going to test 210kWh.

 

[EastFalcon]

I finally got around to doing a capacity test on one of my 18650batterystore grade A Eve cells that I received earlier this year. I removed this cell from one of my mason 280 kits that had 77 cycles (as reported by the seplos BMS).

Test method:
Charge to 3.62V with 40A, 5A cutoff
Discharge to 2.52A with 40A

Hey,

I got 278ah from mine from 18650, but I was using in a 4 pack with a BMS so may be extra 1 AH if used with a standard tester.

I made a battery using 4 cells: https://diysolarforum.com/threads/m...-fun-kits-sfk-v4-heated-kit.63360/post-790577

I think these are what the 280 will do just under 280.

 

[niktak11]

Hey,

I got 278ah from mine from 18650, but I was using in a 4 pack with a BMS so may be extra 1 AH if used with a standard tester.

I made a battery using 4 cells: https://diysolarforum.com/threads/m...-fun-kits-sfk-v4-heated-kit.63360/post-790577

I think these are what the 280 will do just under 280.

None of the ones I tested were that low. What tester did you use?

 

[gotbeans]

None of the ones I tested were that low. What tester did you use?

It is in his linked thread with some cloud link to it. It appears like the cells were actually tested combined together in series as a "12v" battery
Not sure what his "average amps" mean either but if it means it was charged/discharged at much higher current than yours are, that'll easily be a 2 amp hour difference. Slower you charge the more amp hours you can get in a battery though it may take days extra for only a few more amp hours on the ratings.

Nobody in that thread even notices it lol

This is a constant watt test, so the amps go up as the voltage goes down. This will easily give you several amps different in your tests vs a good tester with good settings.

their cloud tests are in series which doesn't really give you perfect idea of the cells either.

Test method:
Charge to 3.62V with 40A, 5A cutoff
Discharge to 2.52A with 40A

See they don't have this, theirs is more like:
charge: 3.65 60 amps and 60 amp cutoff
discharge: 50-60 amp with same cutoff

@EastFalcon I estimate your batteries to get a 280-282 amp hour with the same test that OP does, at the same temperature.