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Tesla Battery Module from PW1
#2
Hi Ben,

I'm in the same situation right now. Both modules were at <2V.

I started charging them outside the house with a few hundred mA charge current through a lab power supply.
During charge I monitored the voltage of every single cell group and took temperature measurements periodically.

Stop charging if one cell behaves differently (voltage not rising or getting warm)!!

Once the pack voltage reached about 20V (all cells at >3V),
I used my rc charger with higher current to charge and balance them to 4.1V.

After a few days, one pack was still at 4.1V and perfectly in balance, but the other had cell groups with high self discharge.
The following discharge test of the good pack showed a total capacity of 160Ah which is the rated capacity of 74x samsung ICR 18650 22 cells. 
Perhaps you are lucky.

The next step is to find and permanently disconnect the cells with high self discharge.
For this purpose I disconnected the fuses of the problematic cell groups.

Do you plan using them with the Tesla Wallbox?

best wishes
Thomas
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Messages In This Thread
Tesla Battery Module from PW1 - by 80211 - 05-19-2020, 05:42 AM
RE: Tesla Battery Module from PW1 - by thom - 05-20-2020, 03:56 PM
RE: Tesla Battery Module from PW1 - by 80211 - 05-21-2020, 02:34 AM
RE: Tesla Battery Module from PW1 - by thom - 05-21-2020, 06:42 AM
RE: Tesla Battery Module from PW1 - by 80211 - 05-23-2020, 10:20 AM

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