Tata Electric Vehicles and Their Critical Warnings; My experience so far!

I highly recommend that everyone run their car to a low SOC level from time to time to see if the battery is behaving normally.

BHPian Mally2 recently shared this with other enthusiasts:

Yes, they are right, the new update removes the high voltage warning, but if there is an underlying problem with the battery that is simply masked by this update.

Here is the graph of my problem

On September 01, this day the turtle mode appeared for the first time at 16% and the high voltage warning at 14%, but the car behaves normally. I made it home because I was very close. I put it on charge and there are no problems with charging. I should have been worried, but I ignored it as a one-time anomaly. I usually only reached 2% and never encountered an Hv warning.

On September 8th I was able to reproduce the same thing. This time at 15% it went into turtle mode and at 14% it went into high voltage alert mode. The car continues to move until you stop it. Once you stop and if the Hv alarm is active, the car will not turn on. I had to turn off the car and wait for a while and then it turned on again. The high pressure warning goes away for a while and the car can drive, albeit in snail mode. Once I got home with a 12% charge level, the car was in high voltage mode and refused to start charging. I tried several times, it wouldn’t charge
I waited for a while, locked, unlocked and locked again. After that, we connected the charger and, fortunately, charging began. I charged the car to 26%, stopped charging, and plan to take it to the Service Center to reproduce it there.

The software update saga

9/11 So they updated the software and drained the battery to 6% but no high voltage warnings were detected. At the moment I’m picking up the car and will test the full package and bring it up to 2-3%.

Today is September 18

The car behaves normally up to 31%, after which the SOC quickly drops by almost 1% every 300 meters. For reference, I only covered 19 km with the last 31%, but 145 km with 100-31% at 123 km/h, which seems pretty accurate. The problem starts at 30% SOc.

In a panic, I went to TASS and reached the 3% SoC level, the last 800 meters reduced the SOC from 9% to 3%.

This time the high voltage alert and turtle mode did not appear. In fact, as properly designed, the turtle is 10%. The regime is advancing, but the rapid decline in SOC continues from 31%

The car returned to TASS: clearly there is a problem with the battery, and the update simply masks the high voltage warning. I find this more disturbing. The car will continue to drive normally down to 0%, but with a rapid drop in SOC.

Therefore, I highly recommend everyone to take their car to a low SOC level from time to time to check if the battery is behaving normally as most problems are found when the SOC level is low. You don’t want to be stuck on the highway at 30%, hoping to get to a charger 20km away, only to realize you can only get 15km of the last 30% due to a battery fault that will now not show up due to the warning high pressure. wear a mask

Please ignore any typos as I am writing from a mobile phone.

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