Service center updated my Ola S1 Pro Gen 2, now the battery drops from 46% to 1% instantly. BMS or Cell 11?
Hi everyone,
I wanted to share what happened with my Ola S1 Pro Gen 2 and see if anyone has experienced something similar.
A few days ago, I started noticing that my scooter’s range had dropped significantly. I normally get around 40–50 Wh/km on my daily commute, but it suddenly increased to 70–75 Wh/km, resulting in much lower range.
I took the scooter to the Ola service center. In the morning, they told me they would trigger an update and asked me to come back later. Around 1:30 PM, they called me and said they’d perform a BMS flow. They also did something they referred to as a “curl update” and then told me the issue was fixed.
I left the service center, but after riding only about 3 km, the battery percentage suddenly dropped from 46% to 1%.
I stopped the scooter and restarted it. The battery immediately went back to 46%, so I assumed it was just a display bug. I continued riding, but about a minute later it happened again—46% to 1%.
I had to push the scooter around 3 km back to the service center.
They checked it again and told me the issue could be:
A faulty BMS board, or
Battery Cell 11.
They also showed me a battery graph where Cell 11 was significantly lower than the other cells.
The frustrating part is that before the service, my only complaint was reduced range. The scooter never randomly dropped from 46% to 1% while riding. That issue started immediately after the BMS flow/update.
I’m not saying the update definitely caused it, but the timing is hard to ignore.
Has anyone here experienced:
Battery percentage jumping from around 40–50% to 1%?
A faulty BMS board causing incorrect battery readings?
A weak battery cell causing the same symptoms?
If your scooter had a similar issue, what was the final fix? Was it a BMS replacement, battery module/pack replacement, or something else?
Any advice or similar experiences would be greatly appreciated. Thanks!