Tata Punch EV 40kWh Charging Curve: Peak 64kW, 20-80% in 34 Minutes

Charging curve data sourced from Tesla Club India (TCIN). Image credit: TCIN / @TeslaClubIndia on X.

Tesla Club India (TCIN) has published the DC fast charging curve for the Tata Punch EV 40kWh variant, tested on a 120kW DC fast charger at an ambient temperature of 34°C — conditions representative of normal Indian driving for a significant part of the year.

The Headline Numbers

The Punch EV 40kWh hits a peak charge rate of approximately 64-65kW between 21% and 31% SOC, which is competitive for a sub-₹13 lakh electric vehicle. The 20-80% charge completes in 34 minutes, and a fuller 12-97% session takes 55 minutes.

The car's peak voltage demand is 420V with a cable amp requirement of 200A. The test was conducted on a 120kW charger with a 300A cable — so the charger was not a limiting factor. What the curve reflects is the car's own charging behaviour.

The Curve Flattens, Then Drops

From peak, the charge rate begins tapering gradually after 40% SOC — dropping from ~64kW to ~56kW by 43% and continuing to step down toward 43kW around 60% SOC. This gradual taper is expected behaviour as the battery approaches mid-range.

What is less expected are three sharp drops to approximately 5kW at 63%, 67%, and 71% SOC, each followed by a rapid recovery back to 43kW. These are abrupt, brief, and repetitive interruptions in an otherwise stable charge rate.

A separate, softer drop to 18kW appears at 77% SOC before recovery, followed by a more sustained taper beginning around 85% SOC down to approximately 10kW approaching 100%. The 85%+ taper is entirely normal expected behaviour in lithium-ion chemistry.

A Question Worth Asking

The three brief 5kW drops in the 63-71% SOC range are the most notable feature of this curve. One possible explanation is thermal management intervention — at 34°C ambient with the pack under sustained DC fast charging, the battery management system may be briefly cutting charge rate to manage cell temperature before resuming. The pattern of drop-and-recover, repeated at similar SOC intervals, is consistent with this kind of thermal event.

This is, however, one data point. A single curve at a single ambient temperature on a single unit is not sufficient to draw firm conclusions. Charger-side communication handshakes can also produce brief power interruptions that appear similar in a curve. More sampling under comparable conditions is needed before any conclusion can be drawn.

What This Means for Owners

For everyday use — overnight AC charging or routine top-ups — none of this is relevant. For owners who regularly use DC fast chargers on longer drives, the 34-minute 20-80% time is practical. The mid-charge drops, if they recur consistently, could add a few minutes to a session but are unlikely to significantly affect the overall fast charging experience based on this sample.

Tata has not commented on the data.