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This article is part of an archived collection from Nikolay Shishkov's blog about first-generation electric vehicles, battery maintenance, modifications, and repairs. Nikolay was an EV pioneer who passed away in 2025. His technical knowledge and generous sharing of information continues to help the EV community.
State of Charge vs Cell Voltage for an Enerdel Battery
By Nikolay Shishkov • September 12, 2017
So here is a graph to help with finding the SOC of an Enerdel cell by measuring the Open Circuit Voltage of the cell.

|
|
| OCV |
SOC |
| 2,50 |
0% |
| 2,73 |
4% |
| 3,00 |
15% |
| 3,94 |
80% |
| 4,10 |
100% |
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