What Are the New Battery Rules?
The Ministry of Road Transport and Highways released draft rules in October 2026 for the next generation of emission standards, dubbed Bharat Stage VII (BS-VII). While these rules tighten norms for petrol and diesel cars, they notably extend to electric
vehicles (EVs) by setting minimum battery durability requirements. According to the draft, EV and plug-in hybrid batteries must retain at least 75% of their original energy capacity after five years of use or 100,000 kilometres, whichever comes first. The standard drops slightly to a minimum of 67% retention after eight years or 160,000 kilometres. These provisions, part of a phased rollout starting in 2029, are designed to ensure that an EV’s most expensive component performs reliably for a reasonable period, moving regulatory focus beyond just manufacturing quality to in-service performance.
Why Are These Durability Standards Needed?
As India's EV market grows, so do concerns about the long-term reliability and resale value of these vehicles. The battery is the heart of an EV, accounting for a significant portion of its cost. Premature degradation not only disappoints owners but also hurts the used EV market, as potential buyers lack confidence in the health of a second-hand battery. By mandating a minimum level of performance over time, the government aims to build consumer trust, ensure a more predictable ownership experience, and reduce electronic waste. These standards are a crucial step to prevent the market from being filled with low-quality batteries that fail early, especially in India's demanding climatic conditions where high temperatures can accelerate battery degradation. It guarantees a baseline of quality and longevity, protecting the consumer's investment.
The Impact on Car Manufacturers
For automotive manufacturers, the BS-VII norms, including the battery provisions, present a significant challenge. The proposed 2029 start date has been met with concern from the industry, which argues the timeline is compressed and requires substantial engineering and R&D resources. Automakers will need to invest in more robust battery packs and advanced battery management systems (BMS) to ensure they meet the degradation targets over eight years. This could potentially divert resources from other areas of EV development and increase the initial cost of vehicles. However, the rules also level the playing field, ensuring all manufacturers are held to the same high standard and preventing a race to the bottom on battery quality.
What This Means for You, the Buyer
For current and future EV buyers, these proposed rules are overwhelmingly positive. The primary benefit is peace of mind. You will have a government-backed assurance that your vehicle's battery won't degrade excessively within the first eight years of ownership. This directly translates to better long-term performance and a more predictable driving range. Furthermore, it should significantly improve the resale value of used EVs, as a battery's health will be a more known quantity. The draft rules also propose an 'Environmental Vehicle Passport', which would give owners clear information on battery health, among other things. While the initial purchase price of EVs might see a slight increase to cover the enhanced technology, the long-term financial and practical benefits of a durable, reliable battery are expected to outweigh the upfront cost.
A Holistic View of Vehicle Pollution
The BS-VII draft is about more than just tailpipes and batteries. For the first time, Indian regulations will also target non-exhaust emissions, which are a source of pollution even for zero-emission EVs. The proposed rules set limits on particulate matter generated by brake wear and tyre abrasion. Starting in 2031, brake particle emissions will be capped, with stricter limits for pure EVs compared to hybrids and conventional cars, before a uniform limit is applied to all passenger vehicles in 2035. This holistic approach acknowledges that all vehicles have an environmental footprint and represents a more comprehensive strategy for improving air quality as the nation's vehicle fleet evolves.
