Rechargion Energy Builds India's First Validated Sodium-Ion Battery Cells From Homegrown Materials

A CSIR spin-off bets on the element that costs a tenth as much as lithium

While most of the conversation around India's battery ambitions centres on lithium-ion gigafactories, a Pune-based deep-tech startup has spent the past five years quietly building an alternative chemistry from the ground up — one based on sodium, an element India has no shortage of. Rechargion Energy has now become the first company in the country to have its sodium-ion battery cells pass ARAI's safety validation testing under the IEC62660/IS 16893 standards, and has built what it describes as India's first dedicated sodium-ion cell fabrication pilot line.

Rechargion was founded in Pune in 2021 by Vilas Shelke and Manjusha Shelke, with Manjusha continuing to serve as a chief scientist at CSIR's National Chemical Laboratory (CSIR-NCL) — the public research institute from which the company originated as a spin-off. That lineage shows in where Rechargion has chosen to compete: not on cell packaging or pack engineering, where most battery startups differentiate, but on the underlying materials chemistry itself. The company has patented its own hard carbon anode material — the substrate sodium ions move in and out of during charging and discharging — along with proprietary electrode materials and sodium compounds developed in-house.

Why sodium, and why now

Lithium-ion battery supply chains remain heavily dependent on imported lithium, cobalt and nickel, exposing Indian manufacturers to global price swings and geopolitical supply risk. Sodium, by contrast, is abundant domestically and does not require cobalt or nickel at all, which strips out two of the most expensive and geopolitically fraught inputs in a conventional lithium-ion cell. Rechargion has said its chemistry is built entirely from materials already available within India, an important distinction for a country trying to reduce its reliance on imported battery inputs as electric-vehicle and grid-storage demand accelerates.

The trade-off with sodium-ion chemistry has traditionally been energy density — sodium-ion cells typically store less energy per kilogram than the best lithium-ion cells — which has confined the technology globally to stationary storage and lower-performance applications rather than long-range electric vehicles. Rechargion's pitch is that for a large share of India's actual battery demand — grid-scale renewable storage, two- and three-wheelers, and other applications where cost and safety matter more than maximum range — that trade-off is one the market should be willing to make, particularly once the cost advantage of a cobalt- and nickel-free chemistry is factored in.

From lab bench to a 500-cells-a-day line

Rechargion's pilot fabrication plant is currently producing cells with capacities up to 10 ampere-hours, a scale that moves the company well past coin-cell lab demonstrations and into cells large enough to power real devices. The company has already demonstrated its cells across a range of applications: solar energy storage — a deployment it showcased to a visiting United Nations Industrial Development Organisation (UNIDO) team — as well as a working sodium-ion-powered bicycle and a drone application, both intended to show that the chemistry can deliver usable power density outside a controlled lab environment.

The ARAI safety certification is a meaningful milestone in its own right: it is the same category of validation that battery packs must clear before being used in regulated applications like vehicles, and being first in India to clear it for sodium-ion cells gives Rechargion a regulatory head start over any domestic competitor still working through the same process. The company is now setting up a larger facility targeting 500 cells a day, a step explicitly aimed at moving from pilot-scale research output to the kind of production volume that would let it supply commercial customers rather than demonstration projects.

A different bet than the gigafactory model

Rechargion's approach sits in deliberate contrast to the capital-intensive gigafactory model that companies like Reliance Industries are pursuing for sodium-ion cells at Jamnagar. Where a gigafactory bets on scale and vertical integration from day one, Rechargion's path runs through owning the fundamental materials chemistry first — the hard carbon anode and electrode formulations — and scaling fabrication capacity incrementally as that chemistry gets validated in the field. Both approaches address the same underlying problem: reducing India's exposure to imported battery materials as demand for electric mobility and grid storage keeps climbing.

The two models also imply different customers. A gigafactory's economics generally only work at automotive volumes, pushing it toward large fleet and OEM contracts from the outset. A materials-first company producing tens of cells a day, scaling toward hundreds, can instead sell into smaller, less demanding use cases first — solar micro-grids, two- and three-wheelers, drones, backup power for telecom towers — building revenue and field data before it ever needs automotive-scale capital. That sequencing matters for a five-year-old company without the balance sheet of a conglomerate: it lets Rechargion prove out safety, cycle life and manufacturing yield at a scale it can actually finance, rather than raising hundreds of millions of dollars against a chemistry that has not yet been stress-tested outside a lab.

What comes next

The near-term test for Rechargion is less about the chemistry — which has now cleared India's formal safety bar — and more about manufacturing consistency at volume. Battery fabrication is notoriously difficult to scale without yield loss, and the gap between a pilot line producing tens of cells a day and a facility running at 500 cells a day is where many promising battery-materials companies worldwide have stumbled, long before their chemistry itself was ever in question. Whether a materials-first, gradually-scaled model like Rechargion's can hold onto its cost and safety advantages as volumes rise — and compete on unit economics against vertically integrated giants entering the same chemistry — will be one of the more closely watched contests in India's energy-storage sector over the next few years.

Sources

• Rechargion builds sodium-ion battery cells from materials India already has
• Rechargion Energy achieves IEC62660 compliance for Sodium-ion batteries
• Rechargion Energy Secures ARAI Safety Test Validation for Sodium-Ion Batteries, Eyes Commercialisation in 2026
• Rechargion Energy's Sodium-Ion Battery Achieves Safety Test Validation from ARAI