The battery chemistry that the automotive industry keeps pushing a decade into the future is already sitting on store shelves. It’s just small enough to fit in your pocket.
At IFA 2026 in Berlin, Belkin announced a credit-card-sized power bank with 5,000mAh capacity, priced at $69.99. What makes it notable isn’t the form factor — it’s the chemistry inside. The UltraCharge Pro Slim Magnetic uses semi-solid-state cells, a hybrid battery technology that replaces most of the flammable liquid electrolyte in conventional lithium-ion batteries with a gel-like layer. Belkin claims the architecture cuts the risk of thermal runaway, fire, and swelling, with dual analogue and digital temperature sensors sampling the cell every 250 milliseconds.
This isn’t a trade-show prototype. The product ships in September.
What “Semi-Solid-State” Actually Means
The terminology can be misleading. A true solid-state battery replaces the liquid electrolyte entirely with a solid material, typically ceramic or polymer. Semi-solid-state — also called semi-solid or hybrid — takes a more pragmatic path: it keeps a small amount of liquid (often 5–10%) but embeds it in a gel or paste matrix. The result is a cell that is neither fully liquid nor fully solid, but delivers measurable gains over conventional lithium-polymer (Li-Po) chemistry.
According to industry data, semi-solid-state cells achieve 260–350 Wh/kg in energy density, roughly double the 130–200 Wh/kg typical of Li-Po. Cycle life improves from 500–800 cycles to 1,000–3,000. Most critically, the gel electrolyte doesn’t ignite even when punctured, overcharged, or exposed to high temperatures — a property that conventional Li-Po cells cannot match.
The trade-off is cost: semi-solid-state cells currently carry a 25–40% premium at the cell level over equivalent Li-Po, though that gap has narrowed sharply from 80–100% in 2024.
Smartphones Are Leading the Charge
Consumer electronics brands haven’t waited for the automotive industry to solve its large-format engineering problems. Chinese phone makers have already shipped semi-solid-state batteries in flagship devices.
iQOO’s Z11 series, launched in March 2026, packs a 9,020mAh “ultra-thin blue ocean” battery co-developed with Amperex Technology Limited (ATL). The cell uses a fourth-generation silicon anode with 16% silicon content and second-generation semi-solid-state technology, achieving an energy density of 879Wh/L. Even at −20°C, the device can play video for 17.25 hours — a meaningful improvement over conventional lithium-ion performance in cold conditions.
Vivo took a different approach with the X Fold6, a foldable phone that fits a 7,000mAh semi-solid-state battery into a form factor where space is at a premium. The device uses a fifth-generation silicon anode and third-generation semi-solid-state technology. Vivo claims it sustains 9.8 hours of continuous operation under intense workloads, a 30% improvement over its predecessor.
Shenzhen-based Yaoshi Lithium, which supplied the semi-solid-state battery for Honor’s Magic V5 foldable flagship, achieved an industry-first 900Wh/L energy density in a phone battery, with a cell thickness of just 2.3mm and silicon anode expansion below 10%. The battery won recognition in TIME’s 2025 Best Inventions list.
The Regulatory Push
China’s new mandatory national standard for power banks, GB 47372—2026, has accelerated adoption. Published in March 2026 and set to take full effect in April 2027, the standard introduces nail penetration testing — a 4mm steel needle driven through the cell’s geometric center at 20mm per second — as a mandatory safety requirement. Traditional lithium-polymer cells ignite within seconds under this test. Semi-solid-state cells pass without thermal runaway.
Manufacturers have responded. Ganfeng Lithium’s 486578S cell, a 5,000mAh semi-solid-state battery just 4.8mm thick, received China’s CCC compulsory certification in July 2026, specifically positioned for ultra-thin magnetic power banks. The certification was issued under both GB 31241—2022 and GB 47372—2026, signaling that semi-solid-state technology is now the default compliance pathway for premium power banks.
Supply Chain Ramps Up
Major battery makers are moving from pilot lines to volume production. Sunwoda has achieved “tens of millions” of semi-solid-state cell shipments in the consumer segment, alongside its established position as the world’s largest supplier of phone batteries by volume. Zhuhai CosMX, one of only two companies globally with mass-production capability for high-end smartphone semi-solid-state cells (the other being ATL), has already begun volume shipments and is supplying a new-generation foldable flagship for an unnamed international brand.
Highpower Technology has begun mass delivery of semi-solid-state batteries for smart glasses and other wearables, and has sent samples to multiple international head-wearable customers for evaluation. The company is also developing full solid-state batteries using a proprietary “adaptive bonding” technology to stabilize the solid-solid interface without external pressure, with trial production expected in 2026.
On the manufacturing side, Zhongshan-based MicroMan Technology received approval for a 5GWh solid-state battery production line project worth RMB 2 billion, designed to produce one million consumer-grade cells per day, targeting phones, drones, and robots.
The EV Contrast
The divergence between consumer electronics and electric vehicles couldn’t be starker. LG Energy Solution told media in August that solid-state car batteries remain “a decade away.” The engineering challenges — dendrite formation, interface stability, and manufacturing yield at large format — are fundamentally different at automotive scale, where cells are orders of magnitude larger and must survive 10–15 years of demanding operating conditions.
Small-format cells sidestep many of these problems. A power bank or phone battery operates in a more controlled thermal environment, and the gel electrolyte’s mechanical properties are easier to manage at smaller dimensions. This is why accessories and handsets have become the proving ground for battery chemistry that the auto industry has been promising for years.
By the Numbers
The market is responding. China’s domestic demand for semi-solid-state phone batteries reached 3.2GWh in 2026, corresponding to a market value of approximately RMB 20 billion, with cumulative cell shipments from Sunwoda, WeLion, and others exceeding 8 million units. Global consumer-electronics solid-state battery revenue is estimated at around $900 million, with phones accounting for 70%. Total solid-state battery shipments in China — predominantly semi-solid — grew from 2.5GWh in 2023 to 10GWh in 2025, and are projected to reach 14GWh in 2026.
The inflection point is clear: 2026 is the year semi-solid-state batteries stopped being a lab curiosity and became a product you can buy at retail. The technology still has a long road ahead before it reaches electric vehicles at scale. But in the gadgets we carry every day, it has already arrived.
