A123 32113 Ultra-B cell, cycling so far

[zeropointbug]

Yeah we know Bondo.

mistercrash, the only graph about 300 you are thinking about is cell level capacity vs. kWh throughput... so after 300kWh have been cycled through the cell, it is at 80% capacity. That is ALOT of energy throughput.

It looks like my cell I bought is on the bottom of the cell capacity range at roughly 4.36Ah, range is 4.3 - 4.5Ah.... maybe the rejects of less than 4.4Ah are sent to resellers in China?

[zeropointbug]

I am finding this thing doesn't have a very linear cell IR, seems to hold a narrow voltage range under load regardless of discharge current. Report back tomorrow for heated discharge test, cell temp will be 170 F.

[mistercrash]

Originally Posted by zeropointbug

mistercrash, the only graph about 300 you are thinking about is cell level capacity vs. kWh throughput... so after 300kWh have been cycled through the cell, it is at 80% capacity. That is ALOT of energy throughput.

Yeah that's what I thought, I didn't understand the graph correctly

[zeropointbug]

Dsch# 145

Cell IR reporting 1mOhm (cell temp 126F) CHARGE

DISCHARGE

Cell voltage: 3.447 (discharged a bit to get rid of top charge~99%)

Cell voltage under load: 3.089v. (after 30 secs of discharge

Discharge time: 1:57

[zeropointbug]

Forgot to post the cell temp at start of discharge: 158F

Cell after discharge: ~170F

[zeropointbug]

FROZEN CELL TEST

Cell temperature: -26 C (-14 F.)

Cell voltage before discharge @ -26 C: 3.456v

Discharge time: 1:56 secs (not 100% DOD, ~70% DOD)

Cell voltage with the 16ft of booster cable (6awg.): 2.02volts
Cell voltage at end of discharge: 2.86volts
Cell temp end discharge: ~10 C (50 F)

Quite a difference in start temp and end temp, at sub zero temperatures the cell is dissipating much more energy as heat... as you can see in the voltage drop.

[zeropointbug]

Dsch#165 IR 2mOhm

4340mah

[zeropointbug]

Any ideas for abusing this cell?