Battery warranty is one of the few EV-specific numbers worth checking carefully before you buy, since it's the single most expensive part of the car to replace out of warranty.
The industry standard: 8 years / 1,60,000 km
Across most Indian EV brands — Tata, Hyundai, Mahindra, BYD — the standard battery warranty is 8 years or 1,60,000 km, whichever comes first. A couple of brands set their own numbers slightly differently: MG covers the ZS EV for 8 years/1,50,000 km, and the smaller Comet for 8 years/1,20,000 km.
This is separate from the vehicle's general warranty (typically 3 years/unlimited km, sometimes extendable), which covers everything else — the battery gets its own, usually longer, warranty specifically because degradation and failure modes differ from a normal mechanical warranty claim.
"Lifetime" battery warranties — what the word actually means here
Several newer models now advertise a "lifetime" battery warranty: Tata's Nexon.ev (45 kWh version), Curvv.ev and Harrier.ev, Mahindra's BE 6 and XEV 9e, and MG's Windsor EV and Comet EV are among the models offering this as of 2026.
In practice, "lifetime" in this context means 15 years from the vehicle's first registration, with no distance cap — not literally forever. There's also an important catch: this lifetime cover is typically tied to the first owner only. If the car is sold, the battery warranty for the second owner reverts to the standard 8 years/1,60,000 km terms. Worth knowing if resale value factors into your decision.
What typically voids a battery warranty
Warranty terms vary by manufacturer, but common exclusions across the industry include:
- Using non-approved third-party chargers regularly
- Physical damage to the battery pack (e.g., from an accident or flooding)
- Modifications to the battery management system
- Commercial use of a vehicle warrantied for private use (a real distinction for ride-hailing/delivery use)
Always check the specific brand's warranty booklet rather than assuming — the broad strokes above are consistent industry-wide, but exact conditions differ by manufacturer.
Facts above checked via web search 2026-09-24.