The single biggest reason electric cars cost more than petrol ones is the battery — it can be a third to nearly half of the whole car's price. So carmakers found a way to take it off the sticker: Battery as a Service, or BaaS. You buy the car without the battery, drive away for lakhs less, and pay a small rental for using the pack instead. In 2026 most of India's mass-market EV makers — Tata, MG, Maruti, Kia, Toyota and Citroen — offer some form of it. This guide explains exactly how BaaS works, what it really costs per kilometre, the fine print that catches people out, and the simple sum that tells you whether it saves you money or quietly costs you more.
What is Battery as a Service (BaaS)?
BaaS unbundles the most expensive component of an electric vehicle from the rest of it. Normally you buy the car and its battery together in one price. Under BaaS you buy only the car — body, motor, electronics — at a sharply reduced price, and the battery is leased to you on a subscription. The provider (the carmaker or a finance partner) owns the pack, insures its performance, keeps it under warranty, and replaces it if it fails.
Almost every Indian BaaS plan charges per kilometre driven rather than a flat monthly fee. You pay a rental rate — say ₹2.60 or ₹3.99 for every kilometre — and that covers the right to use the battery. The appeal is obvious: the battery is the part most buyers worry about for cost, degradation and replacement, and BaaS moves all three of those worries onto someone else's books. If you want to understand why the battery weighs so heavily on EV pricing in the first place, our guide to EV battery replacement cost in India breaks down the per-kWh numbers.
How BaaS works in practice
The mechanics are straightforward once you see the moving parts. When you buy on BaaS, three things change versus a normal purchase:
The upfront price drops sharply. Removing the battery from the price typically cuts ₹2–5.5 lakh off the ex-showroom figure, depending on the model and battery size. That lower price also means a smaller loan and lower EMI if you finance the car.
You pay a per-km battery rental every month. The car logs your distance and you're billed at the agreed rate. Crucially, most plans set a minimum monthly distance you pay for even if you don't drive it — this is the part many buyers miss.
The battery stays under the provider's warranty. For as long as you subscribe, the pack is covered (usually 8 years or 1,60,000 km), and degradation or failure within terms is their problem to fix, not yours.
BaaS costs in India (2026): the real numbers
Rates vary by brand and battery size. Here's how the main BaaS plans on sale in India stack up in 2026 — treat these as indicative for the entry trims, since exact figures change by variant.
| Model | Upfront price with BaaS | Battery rental | Minimum km/month |
|---|---|---|---|
| Tata Tiago EV | From ₹4.69 lakh (saves ~₹2.30 lakh) | ₹2.60 / km | — |
| Tata Punch EV | Cuts upfront by ~₹3.20 lakh | ₹2.60 / km | — |
| Citroen eC3X | From ₹6.89 lakh | ₹2.26 / km | 2,000 km (~₹4,520) |
| Maruti e Vitara (49 kWh) | From ₹10.99 lakh | ₹3.99 / km | 1,800 km (~₹7,182) |
| MG Comet EV | Lower upfront | ₹3.20 / km | — |
| MG Windsor EV | Lower upfront | ₹3.90 / km (38 kWh); ₹4.50 / km (52.9 kWh) | — |
Two things jump out. First, smaller, cheaper cars carry the lowest per-km rates (the Citroen eC3X at ₹2.26/km is the most affordable here), while bigger packs cost more to rent — the MG Windsor's 52.9 kWh unit is nearly double the eC3X rate. Second, the per-km charge usually does not include road tax, insurance, TCS or other statutory costs — those are billed separately, exactly as they would be on any car. For the complete picture of what running an EV costs beyond the battery, see our cost of owning an electric car in India guide.
The minimum-km catch
This is where the headline rate can mislead. A rate of "₹3.99 per km" sounds like you only pay for what you drive — but if the plan bills a 1,800 km monthly minimum, you're effectively committing to ₹7,182 every month whether you cover that distance or not. The Citroen eC3X's 2,000 km floor works out to about ₹4,520 a month. For a light user who drives 600–800 km a month, that minimum quietly inflates the real per-km cost well above the advertised number.
So the cheap-sounding rental only stays cheap if your actual driving sits at or above the minimum. Drive a lot and the floor is irrelevant; drive little and you're subsidising kilometres you never used. Always check the minimum-km clause before you judge a plan by its per-km figure.
BaaS pros and cons
BaaS is genuinely useful for the right buyer and a poor fit for others. Weigh both sides honestly.
| Advantages | Drawbacks |
|---|---|
| Much lower upfront price (₹2–5.5 lakh less) and a smaller loan | Per-km rental can exceed the battery's cost if you drive a lot over many years |
| No battery degradation or replacement risk — it's the provider's problem | Minimum-km billing means you pay even when you barely drive |
| Battery stays under warranty for the subscription | You don't own the battery, which complicates resale and transfer |
| Some plans add perks like a free home charger or assured buyback | Per-km charge excludes road tax, insurance and TCS |
The resale point deserves a closer look. Because you don't own the pack, a used BaaS car can only be sold with the subscription attached — the next owner has to take it over — which shrinks the buyer pool compared with a fully owned EV. Some schemes counter this with an assured buyback (the Maruti e Vitara, for example, offers around 60% of value back after three years). If resale value matters to you, read our guide on EV resale value and battery health in India before deciding.
Run your own numbers
The fastest way to settle it is to run your own driving through the sums. Our free BaaS calculator is pre-loaded with the 2026 plans from Tata, MG, Maruti and Citroen — pick one (or set a custom per-km rate, minimum-km floor and upfront saving to match your dealer quote), dial in your real monthly kilometres and how long you'll keep the car, and it shows your monthly rental, your effective per-km rate after the minimum, and the point where total rental overtakes the upfront saving.
Is BaaS worth it for your driving?
Use the free interactive BaaS calculator — pick a 2026 plan or enter your own quote, and get an instant verdict on whether battery subscription beats buying the battery outright.
Open the BaaS Calculator →Is BaaS worth it? The sum behind the calculator
The answer comes down to your annual distance. Work out two totals over the years you plan to keep the car: on one side, the upfront saving (₹2–5.5 lakh) plus the lower EMI; on the other, the total battery rental you'll pay (your monthly km, or the minimum, whichever is higher, multiplied by the rate, across all those months).
As a rough rule of thumb, a typical urban owner driving around 10,000 km a year often finds BaaS favourable, because reaching the point where rental overtakes the battery's outright cost can take seven to nine years — by which time many people have already sold the car. Drive far more than that — long daily commutes, 20,000+ km a year — and owning the battery outright usually wins. Light, irregular drivers should check the minimum-km floor carefully, because it can erase the saving.
The battery rental is only half the running-cost story — see what you'd spend on electricity versus fuel with our EV vs petrol cost calculator, and if BaaS makes the upfront price work for you, browse the electric car catalog to see which BaaS-eligible models fit your budget. If you're still early in the decision, our best electric cars under ₹15 lakh roundup is a good place to start.
FAQ
What is Battery as a Service (BaaS) in simple terms?+
Is BaaS cheaper than buying the battery outright?+
What is the minimum monthly charge in a BaaS plan?+
Who owns the battery under BaaS, and what about warranty?+
Is there a BaaS calculator to check if it saves me money?+
Does BaaS affect resale value?+
The bottom line on Battery as a Service: it's a clever way to make an EV affordable on day one by renting the costliest part instead of buying it — but it only saves money if your real driving fits the plan. Check the per-km rate, the minimum-km floor and the resale terms together, run your own mileage through the maths, and you'll know whether BaaS is a smart shortcut or an expensive convenience for how you actually drive.