Why this calculator exists
Battery replacement is the biggest fear people have about EVs — and both extremes you hear are wrong. The panic case — "you'll spend ₹80,000 on a battery in three years" — ignores how slowly good batteries actually lose capacity. The relaxed case — "batteries last forever now" — ignores that Indian heat is the toughest battery environment on earth. The truth is simple maths: pack price per kWh, how fast it loses capacity based on your habits, and how many charge cycles it can take.
The most useful number this page produces is the last one: battery cost per km. Take the pack's realistic total distance — range times usable depth times cycle life — and spread the replacement price across it. For a typical 3 kWh scooter pack (₹66,000 at ₹22,000/kWh, roughly 1,000 cycles, ~80 km a charge at 80% depth) that is 64,000 km of battery-funded travel: about ₹1 per km. Add that to ₹0.30 of electricity and the EV still runs at ₹1.30 per km against petrol's ₹2.30 — the economics hold even with the bogeyman priced in. Run the running-cost calculator with this figure added and see for yourself.
Two honest caveats. First: replacement prices fall every year — cell costs have dropped steadily for a decade, so the ₹66,000 you might spend in year 12 will likely cost noticeably less. Second: warranty fine print matters more than the replacement figure itself. A warranty that guarantees 70% capacity for five years transfers most of the early risk to the manufacturer; a defects-only warranty does not. Read our battery warranty explainer before you sign anything, and if you are weighing an EV against petrol with resale in mind, the resale article covers how pack health shows up in used prices.