Featured image credit: Image: Chuq via Wikimedia Commons (CC BY-SA 4.0). Source

By Piyush P. Yadav

You pull into a 60 kW charger with a Nexon EV at 15 per cent, plug in, and the screen shows 42 kW. Twenty minutes later it shows 31 kW. By 85 per cent it is crawling at 12 kW and the person waiting behind you is visibly irritated. Nothing is broken. The number on the charger is a ceiling that the car only touches for a few minutes, if at all, and the rate you actually get is decided by the car’s battery management system, the state of charge, the temperature of the pack and the chemistry of the cells. This explainer sets out how a charging curve works, what each mainstream Indian EV can really draw, and how to plan a fast-charging stop so you spend the least time at the plug.

The charger rating is a maximum, not a promise

A DC fast charger converts grid AC to DC and pushes it directly into the battery. Its rating, 30, 60, 120 or 240 kW, is the most it can supply. But the car is in charge of the session. Its battery management system tells the charger, several times a second, how much current the pack can safely accept. The charger delivers the lower of what it can give and what the car asks for. Three things push the car’s request down:

  • State of charge. A lithium-ion cell accepts current most readily when it is between about 10 and 50 per cent full. As it fills, the voltage rises toward the cell’s maximum and the management system must reduce current to avoid overshooting. Above 80 per cent the reduction is steep.
  • Temperature. Cells have a safe charging window, roughly 10 to 45 degrees C for most chemistries. A pack that arrives hot after an hour on the expressway in May, or one that has been sitting in a Delhi parking lot in January, will be limited until it comes into the window. Cars with liquid cooling manage this; many Indian EVs below Rs 20 lakh use air or passive cooling and cannot.
  • Chemistry and pack design. The maximum charge rate is set by the cell type and how the pack is wired. An NMC pack in a Creta Electric and an LFP pack in a Nexon EV behave differently, and a 400V pack tops out well below an 800V pack. Our guide to LFP and NMC chemistry in Indian EVs has the model-by-model breakdown.

What a real charging curve looks like

The clearest public data for an Indian EV comes from CarDekho’s timed test of a Tata Curvv EV with the 55 kWh pack on a 70 kW charger. The car’s official claim was 10 to 80 per cent in 40 minutes. The test recorded:

State of charge Charging rate observed What is happening
0 to 5 per cent Peak of 65 kW Pack nearly empty, management system allows close to the car’s maximum
35 to 85 per cent 47 to 48 kW The long, flat middle of the curve; most energy is added here
85 to 90 per cent 24 kW Taper begins as cell voltage approaches maximum
95 to 100 per cent 8 kW, 19 minutes for the last 5 per cent Trickle to balance cells
10 to 80 per cent total 47 minutes against 40 claimed Seven minutes slower than Tata’s figure
0 to 100 per cent total 1 hour 28 minutes Nearly half the time is spent above 80 per cent

Two things stand out. The car never sustained its 70 kW rating; it touched 65 kW for a few minutes and spent most of the session under 50 kW. And the last 20 per cent took almost as long as the first 80. That second point is the practical lesson of every charging curve: on a road trip, stopping at 80 per cent and driving on is nearly always faster than waiting for 100.

Peak rates and 10-to-80 times for Indian EVs

The table lists manufacturer-quoted peak DC rates and 10-to-80 per cent times, with real-world notes where tests exist. Treat the claimed times as best case on a charger at least as powerful as the peak rate, with the pack at moderate temperature.

Model Battery Architecture Peak DC Claimed 10 to 80 per cent Notes
Mahindra BE 6, XEV 9e, XEV 9S 59 / 79 kWh 400V 175 kW About 20 minutes on a 175 kW charger Liquid-cooled; the fastest-charging car below Rs 30 lakh
Tata Harrier EV 65 / 75 kWh 400V 120 kW About 25 minutes (20 to 80) on 120 kW Owner data show about 80 kW sustained on 200 A chargers
Hyundai Creta Electric (updated) 42 / 51.4 kWh 400V 100 kW 39 minutes; was 58 minutes on 50 kW before the update NMC pack; software raised the cap in 2026
Kia Syros EV Two packs 400V 100 kW 39 minutes Shares Hyundai-Kia hardware
Maruti e Vitara 49 / 61 kWh 400V 70 kW 45 minutes LFP Blade cells; some listings quote 100 kW peak, Maruti’s own figure is 70
Tata Curvv EV 45 / 55 kWh 400V 70 kW 40 minutes claimed, 47 tested See curve above
Tata Nexon EV (45 kWh) 30 / 45 kWh 400V 60 kW 40 minutes on 60 kW; 56 minutes on 50 kW Older 30 kWh pack peaks lower
MG Windsor EV Pro 52.9 kWh 400V 60 kW 50 minutes (20 to 80) on 60 kW Standard Windsor with 38 kWh is quicker in minutes, slower in kW
MG Comet EV 17.3 kWh 400V No DC charging Not applicable AC only, 3.3 kW
Hyundai Ioniq 5, Kia EV6 84 kWh 800V 350 kW About 18 minutes Need a 350 kW charger to show it; India has a handful
BMW i7 (facelift) 112.4 kWh 400V 250 kW 28 minutes Launching 11 September
Porsche Cayenne Electric 113 kWh 800V 400 kW Under 20 minutes Launching 30 September; only Tata.ev MegaCharger hubs supply 400 kW today

Why the charger you find is usually the bottleneck

Peak rates matter less in India than the table suggests because the network is skewed toward low-power units. Of the 67,657 public chargers counted in the September 2026 Rubix report, 73 per cent are rated below 30 kW, as we analysed in our reading of the Rubix charger census. A 30 kW charger will charge a BE 6 at 30 kW and a Nexon EV at 30 kW; the car’s 175 kW capability is irrelevant. Even at 60 kW units, a BE 6 and a Curvv EV are separated by a few minutes, not the 20-versus-47 the spec sheets imply. The difference only opens up at 120 kW and above, which in September 2026 means Tata.ev MegaChargers, a subset of Zeon, ChargeZone and Statiq highway sites, and dealer hubs from Mahindra and Hyundai.

There is a second, less obvious bottleneck: shared power. Many 120 kW cabinets have two guns and split the output when both are in use, so a car plugged in next to another may see 60 kW. Some 60 kW units are two 30 kW modules with the same behaviour. The charger’s app rarely says so; the rate on the car’s screen does.

Heat, and why the same car charges slower in May

Every Indian EV below about Rs 20 lakh except the Mahindra INGLO cars uses a battery with air or passive cooling. After an hour at 100 km/h on the Mumbai-Pune Expressway in summer, a Nexon EV or Windsor pack can arrive at a charger at 40 degrees C or higher. The management system will hold the rate down until the pack cools, which on a passive pack can take most of the session. Owners report 10-to-80 times 15 to 25 per cent longer in peak summer than in winter for the same car at the same charger. Liquid-cooled cars, the BE 6, XEV 9e, Harrier EV, Creta Electric and the imports, condition the pack while driving and are far less affected. A related effect appears after the session: a hot pack that has just fast-charged may limit power output briefly.

Practical steps: if your car has a navigation-linked preconditioning feature, use it. If it does not, easing off to 80 km/h for the last 20 km before a charger measurably improves the rate you get. And on a 45-degree day, do not expect the claimed time.

Planning a fast-charging stop

  • Arrive low, leave at 80. The curve rewards arriving at 10 to 20 per cent and leaving at 80. Two 20-minute stops on a long drive beat one 60-minute stop.
  • Match the charger to the car. A Nexon EV gains nothing from a 120 kW unit over a 60 kW one; a BE 6 gains 20 minutes. Do not queue for the big charger with a small-battery car.
  • Check the tariff structure. Public charging in India is billed per kWh, sometimes with a per-minute or idle component after a threshold. Slow charging on a per-kWh tariff costs the same per unit however long it takes, but idle fees punish sitting above 80 per cent. The rules on service-charge caps and solar-hour discounts are in our explainer on how public charging prices are set.
  • Use AC at home for the last 20 per cent. The taper above 80 per cent on DC is slower per kWh than an overnight 7 kW AC charge, and cheaper. Our comparison of home versus public charging costs puts the per-kWh gap at roughly two to three times.
  • Do not judge battery health by the rate. A slow session in summer, or one that starts at 60 per cent, tells you nothing about degradation. A consistent drop in peak rate across many sessions in the same conditions might.

The spec sheet number that matters more than peak kW

If you are comparing cars, ask for the average rate over 10 to 80 per cent rather than the peak. Using the figures above, the Curvv EV’s average is about 49 kW against a 70 kW peak; the Creta Electric’s is about 55 kW against 100; the BE 6’s is about 130 kW against 175. That average is what determines how long you stand at a charger, and it is why a car with a modest peak but a flat curve can beat a car with a higher headline number and a sharp taper. Manufacturers do not publish it; independent tests and owner logs do.

Sources & Further Reading

Frequently Asked Questions

Why does my EV charge slower than the charger’s rated power?

The charger rating is a maximum. The car’s battery management system sets the actual rate based on state of charge, battery temperature and cell chemistry, and it reduces current sharply above about 80 per cent. Most cars touch their peak only briefly at low state of charge. A 70 kW-rated Tata Curvv EV, for example, peaked at 65 kW and averaged under 50 kW in an independent test.

Which electric car charges fastest in India?

Among cars below Rs 30 lakh, the Mahindra BE 6 and XEV 9e at 175 kW peak, with about 20 minutes for 10 to 80 per cent on a suitable charger. The Hyundai Ioniq 5 and Kia EV6 accept 350 kW on 800V systems, and the Porsche Cayenne Electric due on 30 September accepts 400 kW, but chargers capable of those rates are rare in India.

Is it bad to fast charge to 100 per cent?

It is slow rather than harmful. Above 80 per cent the rate tapers steeply, and the last 5 per cent can take 15 to 20 minutes. On a road trip it is faster to leave at 80 per cent and stop again. For NMC batteries, routinely charging to 100 per cent also accelerates ageing; for LFP packs it does not.

Why does the same car charge slower in summer?

Battery cells charge safely within a temperature window, and a pack that arrives hot from expressway driving is limited by the management system until it cools. Cars with passive or air-cooled packs, which include most Indian EVs below Rs 20 lakh, are affected most; liquid-cooled cars such as the Mahindra BE 6, Tata Harrier EV and Hyundai Creta Electric condition the pack and are less affected.