Every battery reaches the end of its first job. Storage batteries fade slowly, and one that no longer meets its warranty curve often still holds useful capacity. What happens next is set partly by law, partly by the battery's condition, and partly by what was agreed before it arrived.
What the law says
India's Battery Waste Management Rules 2022, amended since, put the duty on those who bring batteries to market. For a battery energy storage system (BESS), five points matter most:
- Storage batteries are industrial batteries. They sit in their own category under the rules, with their own obligations.
- Importers count as producers. A producer includes a maker selling under its own brand, and anyone who imports batteries or equipment containing them. Importing a battery cabinet or container can make the importer a producer.
- Producers carry extended producer responsibility (EPR). They must see that the batteries they place on the market are collected and then recycled or refurbished.
- No landfill, no incineration. Waste batteries must go to recycling or refurbishment.
- Refurbishers register with the State Pollution Control Board (SPCB). Refurbishment is a recognised route alongside recycling, but only through registered operators.
Storage batteries are industrial batteries; producers, including importers, carry EPR for their collection and recycling or refurbishment.
The rules also set collection and recovery obligations that differ by battery category and have been amended over time. We work from the current Central Pollution Control Board (CPCB) text for each project rather than quoting figures here. For a site owner, the practical point is simple: a storage battery can't be left in a yard or sold to an unregistered scrap dealer. It has to leave through a registered route, and the contract should say whose job that is.
Second life, with its limits
A battery retired from an electric vehicle (EV), or from a demanding storage duty, often still holds a good share of its capacity. Second life puts it to work in a less demanding job before it is recycled. It can make sense, within limits.
Where it can fit. Low-duty, low-risk uses: backup for small loads, gentle daily cycling, and off-grid or pilot systems where the owner accepts a shorter life and closer monitoring. It fits less well where the battery must deliver high power, cycle hard, or sit close to people.
What decides it: testing. Each pack or module needs a state-of-health (SoH) test covering remaining capacity, internal resistance and how evenly the cells have aged, together with the battery management system (BMS) history where it exists. Packs that differ widely don't make a reliable system. UL 1974 and IEC 63330 set out how to evaluate and repurpose used batteries, and they are the references to ask for.
Where it isn't allowed. Some schemes rule it out. Utility-scale storage supported by the central viability gap funding (VGF) scheme is one:
Battery storage projects under the VGF scheme may not use refurbished cells.
Who will insure it. Insurers and lenders are cautious about repurposed batteries, and warranties are usually shorter and narrower than for new systems. Check insurance and warranty terms before committing, not after.
Second life postpones recycling; it doesn't replace it. The same battery still has to reach a registered recycler in the end.
Planning it from day one
End of life is cheapest to handle when it's written down before the battery arrives. Four things belong in the contract:
- An end-of-life clause. Who takes the batteries back, in what condition, and how soon after decommissioning. Where the supplier or importer is the producer, its EPR obligation should be stated in writing.
- Who pays. Take-back, transport and recycling cost money, and recovered materials can have value. Agree how both are shared.
- Logistics as dangerous goods. Lithium batteries travel as dangerous goods: isolated, packed and labelled for transport, with extra care for damaged units. Dismantling a container is planned work, with the same safety discipline as installation.
- Certificates. Ask for the recycler's or refurbisher's registration and the paperwork that closes the EPR trail, and keep it with the system's records.
Earlier choices matter too. Chemistry, labelling and the data the BMS keeps all decide how easy a battery is to test and place later. The CEA's 2026 construction standards already point that way:
From 1 April 2027: an RFID tag on every battery module, recording its origin and test data.
That record helps at the end as much as at the start. We write an end-of-life plan at contract and update it at decommissioning. It covers state-of-health testing, a second-life assessment where one makes sense, and hand-over to registered recyclers or refurbishers. It is the last stage of how we work, and second life and recycling is one of the connections every battery project has.