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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.

Balancing of an Enerdel Think battery pack after water damage

By Nikolay Shishkov • October 04, 2020

EnerdelThink A306Think EV Monitor

This battery pack got water - apparently they use a lot of salt on the roads in Norway and this makes the battery packs rust. And the rust lets water in... then it condensates, and then it destroys the battery management system. And some of the components fail short, and discharge some cells.

After proper drying of the battery and replacement of battery management system the battery is connected to a car and the car is plugged.

This is a graph showing the highest cell voltage and the lowest cell voltage in the pack.

From the trendlines it seems that this pack will be in balance around 11th of October.

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Comments (1)

Unknown

October 04, 2020 at 10:57 AM

Let's see: Fourteen days for 1v change. An Enerdel cell pair should see about 1.7v per 35ah of (dis)charge, that's about 20ah/volt. So, we would expect that 100ma of bypass current to result in 200hr/volt, or about 8.3days per volt. Since the slope is steep initially, I suppose on average, the cell pairs being bypassed see more like 14days per volt.

-Myles