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Does latest Tata cars have active balancer support?

Source: Tata Motors

We all know that earlier versions of tata cars only had passive balancers which was causing issue with battery balancing over a longer run. Because of this few of the battery packs were also required to be balanced externally in order to bring them back to operational conditions. Since a very long time it was being believed that Tata EV cars are only using passive balancers for balancing their battery packs. But recent studies done by us has revealed results of possibility of presence of Active Balancers in recent cars.

Passive Balancer: It is a kind of balancer which only balances all the cells of the battery pack when it is charged all the way up to 100% and having a voltage delta.

Active Balancer: This balancer has the capability to balance the cells of the battery pack whenever it finds voltage delta between the cells of the battery pack. Hence, this can prove to be better option and convenient too for having a balanced battery pack with minimal issues.

For this we have been studing battery packs used in various cars and based on that various data is being published over this blog. Now I will be sharing data for Tata cars which are having latest battery packs. These data is showing clear indication of presence of active balancer in the battery pack.

Nexon 45

To test whether car battery is able to balance at lower SOC for any imbalance in battery cells, owner of the car was taking readings for battery cell voltages at lower SOC. When he reached 23% SOC this was the data from his nexon 45 car.

At 20% SOC, readings were like this

After reaching at this SOC, he had some work so he shut down his car for almost 3 hours. When he returned back to the car and took back the reading. To great surprise, reading were like this

This is indicating that battery pack got balanced on its own even when car was in idle state with powered down. Then he further ran down his car at 17% with these readings.

At 13% SOC

Even one punch ev owner shared the similar experience where he had 140mV delta at 100% but when came down till 14%, this were the stats.


This is showing an indirect sign of active balancer present in Tata batteries and silently working to keep the battery pack balanced enough for making them fault free.

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