A charging curve comparison shared by Tesla Club India on X reveals that the Tata Punch EV 40 kWh is fitted with battery packs from two different suppliers — TACO and Octillion — and the two packs deliver meaningfully different DC fast charging performance.
The Two Packs
The TACO pack uses 120Ah Gotion prismatic cells with a nominal voltage of 337V and a demand voltage of 378.1V, drawing a peak of approximately 184A. The Octillion pack has a higher nominal voltage of 370.3V and demand voltage of 420V, with a peak of approximately 170A. The cell manufacturer for the Octillion pack is not publicly known.
Tata's official DC fast charging claim for the Punch EV 40 kWh is 65 kW.
The Charging Curve
Both packs broadly meet or exceed Tata's 65 kW claim — the TACO pack peaks at 67.2 kW at 51% SOC and the Octillion pack peaks at 65.83 kW at 44% SOC. However the way each pack delivers that power across the SOC range differs significantly.
The TACO pack maintains a high, flat charging curve from around 10% SOC all the way to 51%, holding power well above 60 kW through much of that window. It then steps down but continues to hold reasonably well until around 70-75% SOC before tapering more noticeably.
The Octillion pack peaks earlier — at 44% SOC — and begins stepping down sooner. By 60% SOC the drop is more pronounced than on the TACO pack, and the gap continues to widen through the upper ranges.
In timed charging sessions, the difference is measurable:
- TACO: 10-60% in 19 min | 20-80% in 25 min | 20-90% in 30 min
Octillion: 10-60% in 21 min | 20-80% in 29 min | 20-90% in 36 min
The gap at 20-80% is 4 minutes. At 20-90% it widens to 6 minutes — TACO completes it in 30 minutes, Octillion takes 36. In the 80-90% range specifically, the TACO pack holds a clear advantage. Beyond 90% both packs taper steeply to 100% — normal behaviour for any lithium battery pack approaching full charge.
What This Means for the Buyer
The Punch EV 40 kWh is sold as a single product at a single price regardless of which battery pack is fitted. A buyer has no visibility into which supplier's pack their car comes with at the time of booking/purchase.
Neither pack is defective — both meet Tata's official specifications. But the real world DC fast charging experience differs between the two. An owner with a TACO pack will consistently charge faster than an owner with an Octillion pack, particularly in the 20-90% range that most highway charging sessions cover. The difference of up to 6 minutes per session may seem minor in isolation but adds up across regular long distance use. Will this lead to a different resale value in the future? Only time will tell.
Disclaimer: The photographs of the charging curve and battery packs have been used with permission from respective owners. Removing the logos and sharing the photos without consent from actual owners will amount to copyright infringement.
No comments yet