Is a battery rental plan worth it when buying an EV in India?

What the two schemes actually charge

MG and Kia are the two manufacturers selling what India calls Battery as a Service, where you buy the car without its battery and pay for the battery separately, by the kilometre.

On the Windsor EV, MG's own BaaS FAQ page lists the car starting at ₹9.99 lakh without a battery, with battery rental starting at ₹3.5 per km, excluding charging cost, which the same page puts at about ₹1 per km extra. Most finance partners set a minimum of 1,500 km a month, so even a buyer who drives less pays for that distance.

Kia's Carens Clavis EV BaaS, launched for the 2026 model year, works the same way. Autocar India's report on the launch puts the 42kWh variant's body only price at ₹12.84 lakh, with battery rental fixed at ₹3.3 per km for either the 42kWh or 51.4kWh pack. The vehicle loan runs up to 60 months, but the battery rental commitment can run up to 96 months, eight years, well past the loan on the car itself.

When the sums favour you

Both schemes exist to cut the upfront price, which is the single biggest reason Indian buyers still hesitate on EVs. A body only Windsor costs about ₹5 lakh less to walk out of the showroom than a Windsor with its battery, going by the figures MG itself publishes. That gap matters most to a buyer stretching for a loan, or a cab or fleet operator who runs enough kilometres that a per km charge is just another cost line, the way diesel or CNG already is.

High mileage users are the clearest case. A Bengaluru commuter doing 1,500 km or more a month, crossing the city for work, would be paying for that distance anyway. For someone driving far less, the mandatory minimum eats into the saving, since Zigwheels' review of the Windsor scheme points out you pay for 1,500 km even if you only drove 500 or 1,000.

The catches to weigh before signing

The tax treatment works against the rental math. A full tax briefing from ksandk.com notes that an EV sold with its battery attracts 5 percent GST, while a battery sold or rented separately, the basis of any BaaS plan, falls under the 18 percent slab for standalone lithium ion batteries and battery services. That 13 point gap is built into every rupee of the per km rate you pay, something neither MG's nor Kia's price pages spell out.

Neither company's public material lays out a path back to full ownership once you are on a rental plan, what happens to the rental rate after the battery ages, or how a BaaS car is valued at resale when the next buyer has to take on your rental contract or find a new one. These are the questions to ask your dealer directly, in writing, before signing, not to assume from the brochure.

The Karnataka angle

Karnataka's EV buyers get no separate concession for BaaS cars under the state's road tax exemption, which applies to the vehicle regardless of how the battery is financed. For a Bengaluru buyer, the choice comes down to the same question any BaaS buyer faces anywhere, whether your monthly distance and your appetite for a multi year rental commitment outweigh a lower loan amount today. For a low mileage second car in the city, buying the battery outright and taking the standard 5 percent GST on the whole package is likely to cost less over the ownership period than paying the 18 percent loaded per km rate for kilometres you are not driving.

Sources