QS vs SLDP: How QuantumScape and Solid Power Compare (2026)

Same yardstick, side by side (as of July 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. QS and SLDP share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined QS and SLDP exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

QuantumScape (QS) is a development-stage battery company building solid-state lithium-metal batteries aimed at electric vehicles. Its core technology replaces the conventional liquid electrolyte and graphite anode with a proprietary ceramic solid-state separator and an anode-free design, which the company argues can deliver higher energy density, faster charging, longer cycle life, and improved safety compared with today's lithium-ion cells. QuantumScape has a long-standing partnership and investment from Volkswagen through a joint venture (PowerCo), which is intended to help industrialize and scale the cells for automotive use. The company is pre-revenue in any meaningful commercial sense and has spent years moving from lab cells to multilayer prototypes and early production processes such as its Cobra separator manufacturing technique. Founded in 2010 and headquartered in San Jose, California, QuantumScape went public via a SPAC merger in 2020 and remains a long-horizon, science-driven bet on whether solid-state batteries can be manufactured at automotive scale and cost.

Full QS guide

Solid Power is a Colorado-based battery-technology company developing all-solid-state batteries built around a sulfide-based solid electrolyte, which it positions as a potentially safer, higher-energy-density alternative to today's lithium-ion cells. A central part of its pitch is that the electrolyte can be processed using existing lithium-ion manufacturing equipment, a "drop-in" compatibility the company argues lowers the barrier to commercialization. The business has shifted toward a capital-light model focused on supplying solid electrolyte and licensing its technology to partners rather than building full cell-manufacturing gigafactories itself, with much of the contemplated commercial-scale cell production happening through partners, particularly in Korea.

Full SLDP guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• QS drivers: Solid-state energy and charging advantages; Volkswagen and PowerCo relationship.
• SLDP drivers: Automaker and battery-partner relationships; Electrolyte-supplier and licensing model.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: QuantumScape is pre-revenue and burns cash, so it depends on its balance sheet and periodic capital raises that can dilute shareholders. For SLDP, commercialization is unproven: Solid Power generates minimal revenue (largely partner milestones and grants) and is years away from any solid-state battery reaching mass production, so the timeline is long and uncertain.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick QS if you believe its drivers more; SLDP if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the QS and SLDP guides.

QS. QuantumScape cannot be valued on earnings because it has essentially no commercial revenue. The market prices it on the option value of future solid-state commercialization, so the stock swings sharply on milestone announcements, partnership news, and capital raises. Figures are approximate and change frequently; verify current cash position, burn rate, and share count, which dilution can move materially.

SLDP. For a pre-commercial company like Solid Power, traditional earnings multiples are not meaningful because there is little revenue and no profit. What matters more is the size of the cash cushion relative to annual burn (the runway), progress on technical and partner milestones, and whether the electrolyte-supplier and licensing model produces real orders. The valuation is speculative and can move sharply on partnership news, financing events, or shifts in EV and solid-state-battery sentiment. Figures are approximate and tied to the asOf date.

Headline figures (approximate, early 2026): QS shows revenue (ttm) ~negligible (pre-commercial; verify), profitability Unprofitable; ongoing operating losses, cash burn ~several hundred million per year (verify latest), cash and equivalents ~ over $800 million reported; varies with raises (verify); SLDP shows revenue and grant income (q1 2026) ~$3.1 million, down sharply year over year and driven mainly by SK On and U.S. Department of Energy milestones; effectively pre-revenue from a product-sales standpoint, trailing-twelve-month revenue ~$15.3 million (largely development and grant income, not commercial product sales), net loss (q1 2026) ~$13.0 million, or about ~$0.06 per share, narrower than the ~$15.2 million loss a year earlier, cash and investments ~$435 million total liquidity (cash, equivalents, and available-for-sale securities) as of March 31, 2026, with no debt.

QS and SLDP are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined QS and SLDP exposure against your real portfolio. It is not an investment adviser.