The auto-rickshaw driver pulls into a nondescript station in Bengaluru at 7 AM. Fifteen minutes later, he's gone. Not 15 minutes to 80 percent, the metric that EV companies love to tout. A full zero-to-hundred charge. He'll be back twice more before his shift ends. So will 20 to 30 other drivers that day, each refueling their three-wheelers in the time it takes to grab chai and check messages.
This is what Tuesdays look like at an Exponent Energy e^pump station.
While Tesla races to build out 500-kilowatt Superchargers and Chinese battery giant CATL chases headlines with exotic chemistries promising 400 kilometers in 10 minutes, a Bengaluru startup has placed a different wager. Exponent isn't trying to reinvent the battery cell. It's solving the heat problem—the fundamental bottleneck in fast charging—by moving the hardest part off the vehicle entirely.
The approach has attracted $44.4 million from investors since 2020. More telling, perhaps: OEM partnerships with Altigreen, Omega Seiki, and Montra Electric, companies betting that rapid refueling will unlock commercial EV economics in the world's largest three-wheeler market. Whether that bet pays off depends on execution challenges that venture capital alone can't solve.
Infrastructure Playing Catch-Up
Public charging infrastructure crossed 5 million points globally by the end of 2024, according to the International Energy Agency's Global EV Outlook 2025. More than 1.3 million chargers were added that year. China accounts for roughly 65 percent of the global total, and its fast-charger count jumped from 1.2 million in 2023 to 1.6 million a year later. The US surpassed 50,000 fast chargers in 2024. Europe's ultra-fast network—anything above 150 kilowatts—surged 60 percent year-over-year to exceed 77,000 units.
Still, the build-out barely keeps pace. Europe must add approximately 210,000 public chargers annually through 2030 to hit its target of over 2 million stations, the IEA notes. Public charging capacity needs to increase sixfold by 2035 to match projected EV deployment under the agency's Announced Policies Scenario.
Behind those targets sits a more daunting figure: BloombergNEF estimates $15.8 trillion in grid investment through 2050 in its base case. EV charging is emerging as a major driver of distribution-grid upgrades. The challenge isn't just bolting more chargers to walls. It's reshaping peak demand patterns, managing midday solar peaks in high-renewable systems, and somehow making the economics work for charge point operators facing utilization rates below 20 percent at many sites.
Which brings us back to Bengaluru, where the math might actually pencil out differently.
The Heat Problem, Relocated
Arun Vinayak and Sanjay Byalal Jagannath both came from Ather Energy, India's electric scooter maker. Vinayak served as founding partner and chief product officer before launching Exponent in 2020 with a straightforward thesis: everyone was solving fast charging from the wrong angle.
"15-minute rapid charging is a two-sided problem," Vinayak told TechCrunch in August 2022. "Our e^pump delivers 600 amps while managing individual cell thermals... our tech on both sides manages energy flow efficiently, safely and rapidly—even at 50°C."
The integrated stack has three pieces: the e^pack (battery with proprietary BMS and algorithms), the e^pump (charger with off-board refrigeration), and the e^plug (600-amp connector). The critical insight lies in what Exponent moved off the vehicle. While competitors chase thermal management through advanced cell chemistry or elaborate in-pack cooling systems that add weight and cost, Exponent pumps refrigerated water through the charging cable to cool every cell during the charge cycle.
The heat problem is real, and well-documented. Fast charging can generate 200 to 256 times more thermal load than slow charging, according to scientific literature on extreme fast charging constraints. High charge rates risk lithium plating—metal deposits that degrade capacity and create safety hazards—if cell temperatures and charge algorithms aren't precisely controlled.
TUV India's independent validation in July 2023 provides a benchmark worth noting: after 3,000 rapid-charge cycles, Exponent's LFP-based e^pack showed only 13 percent capacity loss. The company backs this with a 5-year/100,000-kilometer battery warranty on its commercial three-wheeler applications. Whether those numbers hold up across tens of thousands of vehicles in real-world conditions remains the open question.
From Pilots to Production
As of April 2024, Exponent had deployed approximately 60 e^pump stations across six Indian cities. The company was targeting 100 in Delhi-NCR and Bengaluru by year-end and 1,000 stations serving 25,000 EVs by 2025. Those are ambitious numbers for a startup that was barely three years old at the time.
The claimed utilization—20 to 30 charging sessions per day per site—runs roughly 10 times the two sessions per day typical at many conventional fast-charging locations. If accurate, that changes the revenue equation substantially.
The business model centers on OEM partnerships to produce "Exponent-enabled" vehicle variants. Altigreen's neEV Tez cargo three-wheeler, launched in January 2023, carries an 8.2-kilowatt-hour e^pack with 98-kilometer ARAI range and zero-to-hundred percent charge in 15 minutes. Omega Seiki Mobility's Stream City Qik passenger three-wheeler followed in April 2024 with an 8.8 kWh pack and 126-kilometer city range. Montra Electric, part of the sprawling Murugappa Group, added 15-minute fast-charging options to its Super Auto and Super Cargo variants.
Fleet operators have responded. Fyn Mobility partnered with Exponent in February 2023 to deploy Altigreen vehicles in Bengaluru. Alt Mobility announced plans in May 2023 to lease 1,000 Exponent-powered units with 5-year financing at roughly 30 percent lower EMI than conventional offerings.
The startup has been busy expanding. In November 2025, it launched Exponent Oto, a retrofit technology for converting CNG and LPG three-wheelers to EVs with 15-minute charging capability. A revamped charging station design debuted in August 2025. By December 2025, Exponent opened its first retail channel—the Exponent Sales Point in Bengaluru—to sell and retrofit electric three-wheelers directly. Most recently, in February 2026, the company announced Exponent One, a financing arm aimed at improving adoption through tailored financing packages.
That's a lot of initiatives for a company still proving its core technology at scale.
The Cell Chemistry Arms Race
Exponent's chemistry-agnostic approach using commodity LFP cells sits in sharp contrast to the innovations capturing headlines at major battery conferences.
CATL's Shenxing 4C LFP battery, launched in August 2023, promises 400 kilometers in 10 minutes. A Shenxing Pro variant unveiled at IAA 2025 claims approximately 478 kilometers WLTP in 10 minutes. StoreDot demonstrated 10-80 percent charging in roughly 10 minutes with a Polestar 5 prototype in April 2024, chasing a roadmap toward 100 kilometers in 3 minutes by 2028. Nyobolt's prototype achieved 10-80 percent in 4 minutes and 37 seconds using a 350-kilowatt charger with a 35-kilowatt-hour pack.
Infrastructure players are scaling power levels to match. Tesla's V4 Superchargers are moving to 500-kilowatt cabinets starting in 2025. ABB's Terra 360 delivers up to 360 kW. XPeng's S4 network reached over 200 stations by August 2023, with sites offering up to 480 kW and promising 200 kilometers in 5 minutes on 800-volt platforms.
The hardware has evolved to enable what was previously impossible. Liquid-cooled high-power charging cables from HUBER+SUHNER and Phoenix Contact now sustain 500 to 800 amps continuous. The Megawatt Charging System for heavy-duty vehicles saw its technical specification (IEC TS 63379) published in February 2026, with CharIN Testivals in 2025 validating power transfer and ISO 15118-20 mutual authentication.
Battery swapping networks offer yet another path. Battery Smart and Yuma have built out two-wheeler and three-wheeler swap infrastructure in India, delivering instant refueling at the cost of battery standardization, inventory overhead, and significant capital intensity. Tata Power EZ Charge has expanded to 5,500-plus public and semi-public chargers, competing on coverage and reliability rather than 15-minute guarantees.
What distinguishes Exponent isn't technology sophistication—it's the focus on a specific use case where its approach might actually have sustainable economics.
The Profitability Problem
Site economics remain brutally challenging across the EV charging industry. McKinsey analysis suggests 350-kilowatt installations in Europe can run approximately $150,000 per charger before grid upgrade costs. US demand charges—fees based on peak power draw—can make or break profitability. NREL and Department of Energy research shows that co-located storage and managed charging strategies are often necessary to achieve acceptable economics. Break-even typically requires 25-35 percent utilization. Many networks struggle below 20 percent.
Exponent's claimed capital efficiency—roughly ₹5 lakh (about $6,000) per site alongside high daily throughput—matters perhaps more than its charging speed. If a station can serve 20 to 30 vehicles daily with compact 8 to 9 kWh packs instead of six vehicles daily with 60-kWh packs, the revenue math shifts dramatically.
Of course, that's the pitch. Whether it holds up across hundreds of stations in varied locations with fluctuating demand patterns is what Exponent must now demonstrate.
Policy uncertainty adds another layer of complexity. In February 2025, the US Federal Highway Administration paused approvals and spending under the National Electric Vehicle Infrastructure (NEVI) program, creating rollout uncertainty pending revised guidance. India's policy landscape has been more stable, if characteristically byzantine. The FAME incentive program ended in March 2024, replaced by EMPS-2024 as a bridge and then the PM E-Drive scheme launched October 1, 2024, with a ₹10,900 crore outlay extended to March 2028. Delhi's EV 2.0 policy targets fast-charging stations every 5 kilometers on the Outer Ring Road and an expansion from approximately 8,998 to 16,070 charging points in 2026.
The Road Ahead
The technology race appears to be bifurcating. Premium passenger vehicles will likely see sub-10-minute partial charges (10-80 percent) become standard as 800-volt platforms and advanced chemistries mature. Full zero-to-hundred in 15 minutes will remain application-specific: smaller packs, commercial duty cycles, infrastructure-dependent deployments where the total system—vehicle, station, and thermal management—is co-optimized from the ground up.
For three-wheeler and light commercial vehicle segments, where uptime directly translates to driver earnings and pack sizes stay below 15 kWh, rapid refueling creates immediate total cost of ownership advantages. India's three-wheeler market, with roughly 1 million annual sales and growing electrification rates, offers a testbed that doesn't exist at this scale elsewhere.
Exponent's team of 180-plus employees as of February 2024 (approximately 229 by September 2024 EPFO data) faces execution challenges that capital alone can't solve: expanding station density before OEM partners lose faith, proving long-term pack durability in the field, and managing the transition from commercial fleets to potentially larger vehicle formats where its off-board cooling advantage may diminish.
The broader industry is watching not because Exponent's technology will necessarily dominate global passenger EV charging. It won't. But the company demonstrates that architecture choices—where you put the cooling, how you size the pack, what connector amperage you standardize around—can matter as much as cell chemistry breakthroughs. Maybe more, in certain applications.
In a market racing toward that $15.8 trillion grid investment figure, the winners may be those who solve for system economics rather than peak power numbers alone. Exponent is making that bet in the narrow slice of the market where it might actually be correct.
Whether it can execute before competitors with deeper pockets and broader distribution figure out the same equation is the question investors are really asking. The auto-rickshaw drivers in Bengaluru, meanwhile, just want to keep earning. Fifteen minutes at a time.
