How to Invest in Solid State Batteries: Stocks, ETFs, and What the Risk Actually Looks Like

Solid state batteries represent one of the most consequential potential shifts in energy storage in decades. If they reach commercial production at competitive cost, they could displace liquid electrolyte lithium-ion cells in electric vehicles, consumer electronics, and grid storage — a market worth hundreds of billions of dollars annually.

The commercial argument is straightforward: solid state batteries promise higher energy density (meaning longer EV range), faster charging potential, and improved safety. Each of those properties commands a price premium in the EV market, and automakers are racing to be first to offer them.

The investment argument is more nuanced. The technology has been "five years away" from commercialisation for nearly two decades. The difference now is that Toyota, Samsung SDI, QuantumScape, and CATL have moved from conceptual research to pre-production validation. The question is not whether solid state batteries will exist — it is who will manufacture them profitably and when.

A small number of publicly traded companies are focused primarily on solid state battery development. These are pre-revenue technology bets, not operating businesses with stable cash flows.

QuantumScape (NYSE: QS) is the most prominent. Backed by Volkswagen and Bill Gates, it is developing a lithium metal anode with an oxide solid electrolyte separator. QuantumScape has published strong technical data and is in late-stage pre-production validation with Volkswagen's PowerCo. As of mid-2026, it remains pre-revenue with significant quarterly cash burn. The stock has been highly volatile since its 2020 SPAC listing.

Solid Power (NASDAQ: SLDP) has development partnerships with BMW and Ford. It focuses on sulfide-based solid electrolyte cells and has a pilot production line. Like QuantumScape, it is pre-revenue and dependent on partnership milestones and capital raises to fund operations.

The risk profile for both companies is binary in a meaningful sense: if they achieve commercial production at competitive cost, the upside is substantial. If timelines slip further or a larger competitor (Toyota, Samsung SDI, CATL) reaches scale first, the investment thesis weakens significantly.

If the pure-play volatility is too high, automotive OEMs and their battery subsidiaries offer indirect solid state exposure with the ballast of existing revenue from conventional vehicles.

Toyota (NYSE: TM) has the most aggressive public solid state timeline of any major automaker, targeting commercial vehicles with solid state batteries between 2027 and 2028. Toyota also holds more solid state battery patents than any other organisation globally, according to patent data compiled by Nikkei. A Toyota investment is broadly diversified across conventional vehicles, hybrids, and the solid state bet.

Samsung SDI (KRX: 006400) is a major battery supplier developing solid state cells for premium EVs, targeting 2027. It supplies BMW's existing battery packs and is investing heavily in next-generation chemistry.

Panasonic (OTC: PCRFY) supplies Tesla and has announced solid state R&D investment, though its timeline is less public than Toyota's or Samsung SDI's.

The advantage of OEM exposure is that the investment does not depend entirely on solid state commercialisation succeeding on schedule — the rest of the business continues generating revenue regardless.

Exchange-traded funds offer diversified exposure to the battery and EV supply chain without requiring stock selection. Several ETFs hold meaningful positions in companies with solid state development programs.

The Global X Lithium & Battery Tech ETF (LIT) is the most widely held battery-focused ETF. It holds Albemarle, SQM, BYD, Samsung SDI, and other lithium and battery supply chain companies. Solid state exposure is indirect through cell manufacturers and material suppliers.

The KraneShares Electric Vehicles and Future Mobility ETF (KARS) holds a broader set of EV-adjacent companies including automakers, suppliers, and battery makers. It provides exposure to the demand side of solid state batteries through the EV market broadly.

The iShares Self-Driving EV and Tech ETF (IDRV) includes major automakers and tech companies involved in electrification. Toyota and other solid-state-investing OEMs appear in the portfolio.

None of these ETFs are pure solid state plays. They are diversified across existing lithium-ion, EV demand, and emerging battery technologies simultaneously.

Solid state battery investment carries several risks that are easy to underestimate from the outside.

Timeline risk is the most persistent. Toyota originally targeted 2020 for solid state EVs, then 2025, and now 2027–2028. QuantumScape has revised its production timeline multiple times. Every delay extends the period during which invested capital earns no return and faces dilution from ongoing fundraising.

Manufacturing scale-up is unproven. Lab cells and small pilot runs do not guarantee that the same chemistry and performance can be achieved at millions of cells per year. Yield rates, dry-room manufacturing requirements, and supply chain for ceramic electrolyte materials are all open execution questions.

Chinese competition is accelerating. CATL's semi-solid batteries are already in commercial vehicles in China. BYD is investing in solid state R&D. If a Chinese producer reaches cost-competitive full solid state before Western companies, the market dynamics shift significantly.

Incumbent lithium-ion keeps improving. LFP batteries continue to get cheaper and more energy-dense. If solid state commercialises five years later than projected, the gap it needs to close against improved LFP narrows.

Rather than reacting to press releases, investors in solid state should track specific technical and commercial milestones that signal genuine progress.

The most meaningful signal is first verified commercial shipment in a production vehicle — not a concept car or press announcement. When Toyota or a comparable OEM delivers a solid state vehicle to paying customers and the pack goes under warranty, the commercialisation risk decreases substantially.

A second milestone is cost per kilowatt-hour disclosure. Until solid state cells can be produced at below $150/kWh at the pack level, they are not cost-competitive with LFP for volume EV production. Any credible cost roadmap published by a manufacturer is worth examining carefully.

Third, watch gigafactory investment commitments. When a major battery producer breaks ground on a solid state-specific manufacturing facility at gigawatt-hour scale, that signals genuine commercial conviction beyond research agreements and pilot lines.