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A semi-solid-state battery is a battery whose electrolyte combines solid or gel-like material with some liquid or gel phase. It sits between conventional liquid-electrolyte lithium-ion batteries and all-solid-state batteries, which use solid electrolyte instead. The term describes a family of designs, not one standardized recipe—and it does not by itself guarantee better safety, performance, or cost.
What does “semi-solid-state” mean?
In practical terms, a semi-solid-state battery has an electrolyte system that is partly solidified, gelled, or hybridized, rather than entirely liquid or fully liquid-free. POSCO describes semi-solid-state batteries as using gel-type electrolytes between liquid and solid approaches; LG Energy Solution has described combining polymer, oxide, and liquid electrolyte materials; and battery maker BPI describes a solid-liquid system that retains some liquid or gel for ion conductivity. These descriptions point to a broad category, not a single cell architecture.
The label can overlap with “quasi-solid-state” in industry usage, but the sources do not establish the two terms as standardized synonyms. Nor is there a universal liquid-electrolyte percentage: that figure depends on the specific cell design and its published specification. POSCO’s explanation of the distinction is available in its battery technology overview; BPI’s account is in its explanation of semi-solid-state battery composition.
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| Battery category | Electrolyte | How to interpret the label |
|---|---|---|
| Conventional lithium-ion | Liquid electrolyte | The conventional liquid-electrolyte design. |
| Semi-solid-state | A hybrid or gel-like system that retains some liquid or gel phase while incorporating solid or gelled elements. | A broad family of intermediate designs; the exact formulation varies. |
| All-solid-state | Solid electrolyte, with no liquid electrolyte in the cell’s electrolyte system. | A different category, not another name for semi-solid-state. POSCO notes that a solid electrolyte can also function as a separator. |
In short, semi-solid-state batteries are a transitional family of designs, not simply all-solid-state batteries under another name. A product description that uses either label is not enough to establish its exact electrolyte formulation.
#1 Best Overall
- Semi-Solid-State Battery for Safer Travel Power: Semi-solid-state battery design helps deliver safer, more stable charging in hot, cold, and everyday travel conditions. This portable charger power bank is built for road trips, flights, camping, commuting, and daily carry when reliable backup power matters.
- 10,000mAh Power Bank, Slim Enough for Every Day: Get 10,000mAh power in an ultra-slim 0.57-inch body that weighs only 6.9 oz. This small portable charger slips easily into a pocket, purse, backpack, or carry-on, giving you dependable power without the bulky brick feel.
- 15W Wireless + 30W USB-C Fast Charging: Snap on for up to 15W magnetic wireless charging, or plug in for up to 30W USB-C fast charging when you need power fast. A flexible magnetic portable charger and power bank for iPhone 16, 15, 14, 13, and 12 series.
- Built for Flights, Hotels, Road Trips, and Long Days Out: TSA-friendly capacity makes this battery pack charger portable for air travel, vacations, theme parks, work trips, and power outages. Pass-through charging lets you charge your phone and power bank together overnight with one USB-C cable.
- Smart Display, Low-Current Mode & TORRASCare Support: The digital display shows remaining battery at a glance before you head out. Low-current mode supports earbuds, AirPods, and other small devices, while 18-month TORRASCare support gives you added confidence for daily use and travel.
Why are semi-solid-state batteries being developed?
The engineering goal is to combine aspects of liquid- and solid-electrolyte systems. In a 2024 interview, Dong-gyu Kim, then in charge of LG Energy Solution’s Semi-Solid-State Battery Team, described the approach as combining materials to move beyond the limits of a single technology. LG Energy Solution and POSCO have also said that some designs could use much of the conventional lithium-ion manufacturing process. Those are company descriptions of the technology’s rationale, not proof that every semi-solid design is easier or cheaper to manufacture, or safer than a conventional battery.
LG Energy Solution has discussed electric vehicles and wearables as potential applications. These are intended uses, not evidence that products using the technology are broadly available to consumers. Its interview explains the company’s view of the approach and its applications in “How Will Semi-Solid-State Batteries Change Our Lives?”.
Rank #2
- SEMI-SOLID-STATE SAFETY, BUILT FOR TRAVEL: Semi-solid-state cells hold a fraction of the flammable liquid in ordinary lithium-ion and resist thermal failure. In internal testing, the cells were puncture, cut and drill tested with no fire. The aluminum housing is highly thermally conductive, helping draw heat away from the cells and dissipate it during charging. Under 100Wh, it's airline carry-on ready.
- ALL-DAY POWER, STILL POCKETABLE: A full 10,000mAh gives a typical iPhone roughly 1.5 to 2 charges - plenty for long travel days, events and back-to-back workdays without chasing an outlet. The dense semi-solid state design (a paired 5,000mAh + 5,000mAh layout) keeps the pack slim enough to slip into a jacket pocket or bag. The built-in lanyard doubles as a USB-C cable, so a charging cord is always attached - nothing extra to pack or lose.
- QI2-CERTIFIED 15W MAGNETIC CHARGING: A strong, precisely aligned magnet snaps onto iPhone 17, 16, 15, 14, 13 and 12 with precise alignment and a strong hold, so you can keep using your phone while it charges. As a Qi2-certified, MagSafe-compatible charger, the magnetic connection keeps the charger aligned while you scroll, text, or move.
- DUAL USB-C, UP TO 30W OUTPUT: Two USB-C ports let you charge several devices at once and deliver up to 30W of fast wired power for phones, earbuds and tablets. The same port also refills the 10K itself quickly, so it's ready for the next day. (Large tablets and laptops draw more and may only charge partially.)
- FULL-COLOR LCD DISPLAY: A crisp color screen shows exact battery percentage plus live input and output wattage, so you always know how much power is left and how fast each device is charging - no blinking LEDs to decode. It stays easy to read at a glance, whether you're commuting, at an event, on a shoot or working late.
Are semi-solid-state batteries used in electric cars?
Yes, some electric vehicles had been reported as using them, but the deployment figures and model examples need a date and geographic scope. TrendForce’s 4 February 2025 report estimated that semi-solid-state battery use in EVs worldwide remained below 2 GWh in 2024, with market penetration below 0.5%. The report said deployments at that time were in China and named the IM L6, NIO ET7, Seres 5, DongFeng Aeolus E70, and Voyah Passion. It reported no mass-produced semi-solid-state EV models outside China at that time. These dated findings should not be read as a current worldwide availability list.
TrendForce also forecast in 2025 that semi-solid-state batteries would exceed 1% global EV market penetration by 2027. That was a forecast, not a verified result. The same report named Ganfeng Lithium, Farasis Energy, and WeLion New Energy as manufacturers developing the technology and described GWh-level production. See TrendForce’s 4 February 2025 report for its market estimates and examples.
Rank #3
- WORLD'S THINNEST SEMI-SOLID-STATE 5,000MAH: At just 6.8mm at its thinnest point, the Air is the slimmest semi-solid-state Qi2 power bank you can buy — the semi-solid-state design supports this slim form factor while helping the cells stay stable and reducing fire risk. It sits flush against your iPhone and slips into a pocket, slim bag or clutch. TechRadar Pro CES 2026 Picks Award Winner.
- SEMI-SOLID-STATE SAFETY, BUILT FOR TRAVEL: Unlike conventional lithium-ion banks with a flammable liquid electrolyte, SolidSafe Air's semi-solid-state cells sharply cut the liquid component — lowering risk at the cell level and staying stable under heat, stress and impact. It's not a circuit-only fix but a fundamental change in chemistry. At 18.5Wh, it's airline carry-on ready.
- 15W QI2 MAGNETIC + 20W USB-C: Qi2-certified, MagSafe-compatible magnetic charging snaps onto iPhone 17, 16, 15, 14, 13 and 12 with precise, secure alignment, while the USB-C port delivers up to 20W when you're in a hurry. The 5,000mAh cell gives a modern iPhone roughly one full top-up, and you can charge wired and wireless at the same time.
- TITANIUM SHELL, BUILT TO LAST: A titanium-reinforced shell resists dents and drops, and titanium's high thermal conductivity helps draw heat away from the cells and dissipate it at the surface during charging. It's premium protection that keeps the Air tough and travel-ready in a remarkably slim form.
- CCC CERTIFIED FOR TRAVEL: CCC certified for battery compliance and travel in China, with FCC, CE and UKCA listings for other regions. Built-in circuit safeguards cover overcharge, over-discharge, overcurrent and short circuits. Magnetic charging suits MagSafe iPhones or a thin compatible case; for Pixel and other Android phones, use a magnetic case or the 20W USB-C port.
What are the limitations?
In its February 2025 assessment, TrendForce identified cost, charge/discharge efficiency, and cycle life as areas where semi-solid-state batteries lagged conventional liquid-electrolyte batteries. Because the label covers multiple designs, those findings should not be treated as a permanent ranking of every cell called semi-solid-state.
When evaluating a particular battery, look for details on the cell chemistry and architecture, the amount and role of any remaining liquid, and the conditions and methods used for safety testing. Compare measured energy density, cost, charge/discharge efficiency, cycle life, and manufacturing readiness only when the figures refer to comparable designs and test conditions. There is not enough common specification here to give the category a universal quantitative performance ranking.
Quick Recap
What does the name tell you—and what does it not?
- It tells you: the electrolyte is described as partly solid, gel-like, or hybrid rather than purely liquid or fully solid.
- It does not tell you: the exact electrolyte recipe, the fraction of liquid, a standardized technical architecture, or a guaranteed safety or performance advantage.
- For a specific product: consult its cell-level specifications and test results rather than relying on the category name alone.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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