SUN Mobility’s Battery-as-a-Service Business Model

Industry & Competitive Context

India’s electric vehicle transition has been constrained less by vehicle demand than by energy infrastructure. Lithium-ion batteries represent 30–40% of an electric two- or three-wheeler’s upfront cost, charging times for slow AC charging run into hours, and public charging infrastructure in Indian cities remains uneven. This cost and convenience gap created an opening for an alternative energy-delivery model: Battery-as-a-Service (BaaS), in which the battery is decoupled from the vehicle and supplied instead as a subscription or pay-per-use energy service, with depleted batteries exchanged for charged ones at dedicated stations.

SUN Mobility, founded in 2017 as a joint venture between the Maini Group and the SUN Group, built its business around this model. Its co-founders are Chetan Maini, who is credited with inventing the Reva electric car in 1999 and holds more than 35 patents, and Uday Khemka, Vice-Chairman of the SUN Group, with Ajay Goel joining later as a co-founder and as Executive Director & COO. The company is headquartered in Bengaluru and designs, manufactures, and deploys smart batteries and what it calls Quick Interchange Stations, where a depleted battery is swapped for a charged one in under two minutes.

The Indian battery-swapping segment is not a single-player market. Battery Smart, another Indian BaaS operator focused on two- and three-wheelers, has raised successive funding rounds, including a $25 million Series A round and a later $15 million debt facility from Mirova, positioning it as a direct competitor pursuing the same gig-economy and last-mile delivery fleet segment. The regulatory environment has also moved to support the category: in April 2022, India’s NITI Aayog released a draft Battery Swapping Policy for public and industry consultation, aimed at establishing standards and incentive structures for swappable-battery EVs. This combination of a structural cost problem, policy attention, and multiple funded competitors defines the competitive field SUN Mobility operates in.

Brand Situation Prior to Scale-Up

By the early 2020s, SUN Mobility had established the core elements of its model but at a limited geographic footprint. Bosch had acquired a 26% stake in the company in 2019, an early signal of strategic validation from a global automotive-technology player. In 2021, Vitol, parent of fuel retailer Vivo Energy, invested $50 million specifically to expand battery-swapping infrastructure in India and in select international markets. At this stage, the company’s network remained a standalone infrastructure build-out, dependent on siting its own Quick Interchange Stations rather than leveraging an existing retail footprint.

By June 2024, when SUN Mobility entered its joint venture with Indian Oil Corporation (IOCL), the company had grown to more than 25,000 electric vehicles supported across 20 cities, operating over 630 stations and more than 50,000 smart batteries, and enabling over one million swaps per month. This was a meaningful operating base, but it was a fraction of the density required to make battery swapping a default energy option comparable to fuel refilling, and it was built without access to the fuel-retail real estate that could accelerate siting.

Strategic Objective

SUN Mobility’s stated strategic objective, as articulated through its IndianOil partnership and subsequent international financing, had two parts. Domestically, the objective was to convert battery swapping from a niche infrastructure build into a network with the density and distribution reach of conventional fuel retail explicitly targeting parity with the convenience of a petrol station. Internationally, following the 2025 investment from Helios Climate and the Private Infrastructure Development Group (PIDG), the objective extended to establishing what the company described as Africa’s largest battery-swapping network, alongside growth in Southeast Asia, applying the same decoupled-battery model to new two- and three-wheeler markets with similarly high EV-upfront-cost barriers.

Business Model Architecture & Execution

The architecture of SUN Mobility’s BaaS model rests on separating battery ownership from vehicle ownership. A customer purchases or leases a vehicle without its battery, substantially lowering the upfront purchase price, and instead pays for energy on a per-swap, consumption-based basis. This converts a capital expenditure (the battery, often the single largest cost component of an electric two- or three-wheeler) into an operating expense paid incrementally, which the company has stated is intended to address three adoption barriers simultaneously: high upfront vehicle cost, charging time, and range anxiety, since a swap takes under two minutes rather than requiring hours of charging.

Execution of this architecture has depended heavily on strategic partnerships that provided capital, retail distribution, or manufacturing credibility rather than on SUN Mobility building every asset independently. Bosch’s 2019 equity stake linked the company to established automotive-component expertise. Vitol’s 2021 investment, channeled through a fuel-retail parent company, provided both capital and an early signal of alignment between a traditional energy retailer and a battery-swapping model. The most structurally significant move came in June 2024, when SUN Mobility and IndianOil formed a 50:50 joint venture, Indofast Swap Energy Private Limited, to build out swapping infrastructure using IndianOil’s existing network of more than 37,000 fuel stations across India as potential sites. This joint venture set a public target of deploying more than 10,000 battery-swapping stations and covering more than 40 cities within three years, with an ambition to build one of the largest battery-swapping networks globally by 2030, focused on two-wheelers, three-wheelers, and small commercial four-wheelers under two tonnes.

The execution logic here is a classic infrastructure-distribution partnership: rather than acquiring or leasing real estate and building retail presence from scratch, SUN Mobility used a joint venture to convert an incumbent fuel retailer’s existing physical network into a parallel distribution channel for battery energy, while IndianOil gained a stake in an emerging energy category adjacent to its core fuel-retail business. In July 2025, the company extended this distribution-and-capital logic internationally, with Helios Climate and PIDG backing an African expansion, alongside continued growth in India; reporting at the time noted SUN Mobility had raised approximately $135 million in capital over the preceding year and had grown to more than 900 swapping stations powering a fleet exceeding 50,000 vehicles, with battery technology developed and manufactured in India and extended to two-wheelers, three-wheelers, four-wheelers, and heavy electric vehicles.

Positioning & Consumer Insight

SUN Mobility’s positioning is built on a specific consumer insight: for cost-sensitive EV buyers, particularly operators of two- and three-wheelers used for commercial purposes such as delivery and ride-hailing, the battery is not merely a vehicle component but the primary financial obstacle to adoption, and the primary source of operational downtime once in use. By removing the battery from the balance sheet and converting it to a per-use energy cost, the company’s positioning targets commercial fleet operators and individual gig-economy drivers whose vehicle economics depend on maximizing uptime and minimizing upfront capital outlay, rather than private consumers purchasing a vehicle as a long-term asset.

This positioning is reinforced by the company’s public framing of its ambition as making battery swapping “as accessible as conventional fuel stations,” a direct analogy to the refueling behavior commercial vehicle operators already understand, rather than asking them to adopt a new behavior such as home or depot charging. Chetan Maini has stated the company built “a modular, fast, and scalable battery swapping ecosystem that adapts to real-world mobility needs,” a formulation that positions the offering around operational flexibility for fleet use cases rather than around environmental messaging. Helios Climate’s Partner & Co-Head, Tavraj Banga, described SUN Mobility on the occasion of the 2025 investment as “a global category leader with a differentiated and proven solution for the e-mobility space,” indicating that institutional investors backing the company have also adopted a category-leadership framing rather than a purely technology-differentiation one.

Media & Channel Strategy

The company’s go-to-market activity, as documented in public sources, has been structured as a distribution and infrastructure-partnership strategy rather than a media campaign. The central channel decision was the 2024 joint venture with IndianOil, which gave SUN Mobility access to siting opportunities within IndianOil’s retail fuel network as the primary mechanism for scaling physical touchpoints, in place of building a standalone retail network or relying on paid consumer advertising to drive trial. Internationally, the 2025 Helios Climate and PIDG investment similarly functioned as a channel strategy in the form of development-finance and climate-investor backing to fund market entry into Africa and Southeast Asia, rather than as a demand-generation campaign.

Business & Brand Outcomes

Several outcomes are documented through company financial filings reported in trade media and through partner and investor disclosures. On the financial side, SUN Mobility Private Limited’s revenue for FY2025-26 was reported at Rs 594.88 crore, up 79% from Rs 331.71 crore in FY2024-25. Over the same period, the company’s net loss narrowed to Rs 9.33 crore from Rs 92.43 crore, a reduction of nearly 90%, even as total expenditure rose to Rs 621.74 crore from Rs 430.74 crore. Research and development spending rose sharply to Rs 35.4 crore in FY2025-26 from Rs 7.8 crore in FY2024-25, an increase of 354%, taking R&D intensity from 2.35% of revenue to close to 6%. These figures indicate a company scaling revenue substantially faster than its losses, while simultaneously increasing investment intensity in its core battery and station technology.

On infrastructure outcomes, the company’s own disclosures show growth from more than 630 stations and 50,000 smart batteries supporting over 25,000 EVs across 20 cities at the time of the IndianOil joint venture in June 2024, to more than 900 swapping stations powering a fleet exceeding 50,000 vehicles by the time of the Helios Climate and PIDG investment in July 2025. Swap-volume figures cited by the company have also risen, from over one million swaps per month reported around the IndianOil announcement to a figure of 1.4 million monthly swaps in India cited by Chetan Maini at the time of the 2025 funding round; this later figure is a company claim rather than an independently audited statistic. On the capital side, the company’s cumulative strategic investor base documented in public sources includes Bosch (a 26% equity stake acquired in 2019), Vitol (a $50 million investment in 2021), IndianOil (a 50:50 joint venture structure from 2024), and Helios Climate and PIDG (a 2025 investment round within a reported $135 million raised over the preceding year). No verified public information is available on SUN Mobility’s valuation, profitability targets, customer retention, or any brand-tracking or awareness metrics, as these have not been disclosed in the sources reviewed.

Strategic Implications

SUN Mobility’s trajectory illustrates a distribution-first approach to scaling capital-intensive infrastructure businesses in emerging markets: rather than building a parallel retail network from the ground up, the company’s most consequential scaling decision was a joint venture that converted an incumbent energy retailer’s existing physical footprint into its own growth channel. This suggests that in infrastructure-dependent business models competing against both behavioral inertia (established refueling habits) and capital constraints (high battery costs), partnering with an incumbent holding the relevant physical distribution asset can be a more capital-efficient path to density than vertically integrated expansion, provided the incumbent has a commercial incentive to participate, as IndianOil appears to have had in diversifying into EV-adjacent energy retailing.

The financial pattern disclosed for FY2025-26 sharply rising revenue, a substantially narrowed net loss, and a simultaneous large increase in R&D intensity is also instructive for how infrastructure-model companies can be read by analysts: a rapid narrowing of losses alongside rising R&D spend as a share of revenue indicates that cost efficiencies are being realized in the operating model even as the company reinvests more heavily in its core technology, rather than achieving margin improvement by cutting innovation spend. The extension of the same BaaS and joint-venture architecture into Africa and Southeast Asia through development-finance-oriented investors such as PIDG, rather than purely commercial venture capital, further suggests that this model has found a financing match among investors whose mandates specifically reward infrastructure build-out in markets with weaker existing energy-retail density than India’s, implying the BaaS joint-venture template may be more exportable to markets where fuel-retail incumbents can similarly be recruited as distribution partners than to markets lacking such incumbents.

Discussion Questions

1. What specific structural conditions made a joint venture with an incumbent fuel retailer a more effective distribution strategy for SUN Mobility than building its own retail network, and under what market conditions might this approach not transfer?

2. How does converting a capital expenditure (the battery) into an operating expense (per-swap payment) change the addressable customer base for electric two- and three-wheelers, and which customer segments benefit most from this shift?

3. Given the documented financial pattern of rising revenue, narrowing losses, and increasing R&D intensity, what does this combination suggest about where SUN Mobility may currently be creating competitive advantage, and what risks remain unaddressed by the available public disclosures?

4. How should SUN Mobility evaluate competitive risk from rival BaaS operators such as Battery Smart, given that both companies are pursuing overlapping two- and three-wheeler fleet segments in the same regulatory environment?

5. What are the implications of financing international expansion through development-finance and climate-investment vehicles such as PIDG, rather than solely through commercial venture capital, for how SUN Mobility should prioritize markets in Africa and Southeast Asia versus continued scale-up in India?