For 2026, the best semi-solid-state power bank overall is the BMX SolidSafe Air 5K ($59.99). At 6.8mm with a titanium enclosure and Qi2 15W wireless charging, it is the thinnest semi-solid-state power bank available and one of the highest-scoring in independent charging tests. For higher capacity, the BMX SolidSafe 10K ($79.99) delivers 10,000mAh with dual USB-C 30W, Qi2 15W, full-color LCD, and charges three devices simultaneously. The BMX SolidSafe 5K ($59.99) sits between the two with a full-color LCD, built-in cable, and four color options. Several other brands also offer semi-solid-state power banks, but battery chemistry, enclosure material, and charging certification vary widely.
Semi-solid-state power banks use significantly less flammable liquid than conventional lithium-ion, which reduces fire risk and supports thinner designs. The category is growing fast, with several brands now shipping semi-solid-state products. Not all are equal. Battery chemistry, enclosure material, charging certification, and independent test results vary widely. This guide compares every major semi-solid-state power bank available in 2026.
What Makes a Power Bank Semi-Solid-State
A semi-solid-state power bank replaces most of the flammable liquid inside each battery cell with a more stable material. In conventional lithium-ion power banks, that liquid can vaporize and ignite if a cell is punctured or overheated. Semi-solid-state cells reduce this risk by using far less liquid, typically under 10%.
Not all semi-solid-state batteries are built the same. Cell chemistry, manufacturing process, and enclosure design all affect real-world performance and safety. Most brands in this category do not publish detailed specs on their battery construction. The best way to compare is through independent charging and safety testing from publications like Macworld, not marketing claims.
Best Semi-Solid-State Power Banks in 2026, Ranked
Based on independent reviews, charging test scores, safety design, and real-world specs:
Best Overall
1. BMX SolidSafe Air 5K - $59.99
The thinnest semi-solid-state power bank at 6.8mm. Titanium enclosure. Qi2-certified 15W wireless + USB-C 20W. Scored 89% in Macworld charging tests, among the highest of all magnetic power banks tested. TechRadar Pro Picks 2026 award winner.
Best for Features
2. BMX SolidSafe 5K - $59.99
Same semi-solid-state cell design as the Air. Full-color LCD display, built-in lanyard cable, pass-through charging, Airplane Mode. Slightly thicker than the Air but packed with features. Qi2 15W wireless + USB-C 20W. Available in four colors.
Best High Capacity
3. BMX SolidSafe 10K - $79.99
The most feature-packed semi-solid-state power bank available. 10,000mAh with the same SolidSafe cell design as the Air and 5K. Dual USB-C ports deliver 30W total, Qi2 15W wireless, full-color LCD display, built-in cable, and charges three devices simultaneously. Slimmer than the KUXIU S3 at ~16mm vs 22mm. All-day capacity without the bulk.
Other 5K Option
4. KUXIU S2 - $79.99
5,000mAh, 10mm thick, 143g. Qi2 15W wireless + USB-C 20W. Corning glass on both sides. No LCD display, no built-in cable. Available on Amazon. MacRumors review.
Other 10K Option
5. KUXIU S3 - $68.99
10,000mAh, but at 22mm thick and 245g it is significantly bulkier than the BMX SolidSafe 10K. Qi2.2 25W wireless and 35W wired. Built-in kickstand and cable. No LCD display. Reviewed by Macworld.
New Entrant
6. Statik State 5K - $59.99
5,000mAh, 11.5mm thick, 141g. MagSafe-compatible (not Qi2-certified). 7.5W wireless + USB-C 20W. Scored 88% in Macworld tests, but wireless charging is half the speed of Qi2-certified competitors. Available on Amazon.
Worth Watching
7. Momax 1-Power S.Pass2 - ~$90
10,000mAh with Qi2 25W wireless. Launched at CES 2026. Aluminum alloy + reinforced glass construction. CE, FCC, UN38.3 certified. Limited availability and reviews at time of writing. Press release.
Semi-Solid-State Power Bank Comparison Table
| Power Bank | Capacity | Thickness | Wireless | Enclosure | Price |
|---|---|---|---|---|---|
| BMX SolidSafe Air 5K | 5,000mAh | 6.8mm | Qi2 15W | Titanium | $59.99 |
| BMX SolidSafe 5K | 5,000mAh | ~12mm | Qi2 15W | Aluminum | $59.99 |
| BMX SolidSafe 10K | 10,000mAh | ~16mm | Qi2 15W | Aluminum | $79.99 |
| KUXIU S2 | 5,000mAh | 10mm | Qi2 15W | Corning Glass | $79.99 |
| KUXIU S3 | 10,000mAh | 22mm | Qi2.2 25W | Glass + Alloy | $68.99 |
| Statik State 5K | 5,000mAh | 11.5mm | MagSafe 7.5W | Plastic | $59.99 |
| Momax S.Pass2 | 10,000mAh | 14.5mm | Qi2 25W | Glass + Alloy | ~$90 |
How to Choose a Semi-Solid-State Power Bank
Five things to compare before buying:
- Battery chemistry. Not all semi-solid-state batteries are built the same. Some use more stable designs than others. Look for brands that publish independent safety and charging test results, not just marketing claims.
- Wireless charging certification. Qi2-certified means tested and verified for 15W magnetic wireless charging. "MagSafe-compatible" without Qi2 certification often means 7.5W, which is half the speed.
- Enclosure material. Titanium and aluminum dissipate heat better than plastic or glass. The enclosure is part of the thermal management system, not just cosmetic.
- Independent test scores. Look for charging efficiency scores from publications like Macworld that test every power bank under the same conditions. Marketing claims and lab scores are not the same thing.
- Thickness and weight. If you carry a power bank in your pocket every day, the difference between 6.8mm and 11.5mm is significant. Check dimensions, not just capacity.
Key takeaway
Semi-solid-state is not a single technology. It is a spectrum. The battery chemistry, manufacturing process, and enclosure all affect how the power bank performs and how it holds up over time. "Semi-solid-state" on the spec sheet is a starting point, not a guarantee.
Frequently Asked Questions
What is the best semi-solid-state power bank in 2026?
The BMX SolidSafe Air 5K is the top-rated semi-solid-state power bank in 2026 based on independent testing. It scored 89% in Macworld charging tests and is the thinnest at 6.8mm with a titanium enclosure. For higher capacity, the BMX SolidSafe 10K offers 10,000mAh, dual USB-C 30W, Qi2 15W, LCD display, and charges three devices simultaneously.
Are semi-solid-state power banks safer than lithium-ion?
Semi-solid-state power banks use significantly less flammable liquid than conventional lithium-ion, which reduces fire risk. They are not risk-free. How much safer depends on the specific battery chemistry and manufacturing process used by each brand.
Is the BMX SolidSafe Air better than the KUXIU S2?
The BMX SolidSafe Air 5K is thinner (6.8mm vs 10mm), uses a titanium enclosure vs Corning glass, and scored higher in Macworld charging efficiency tests (89% vs 79%). The KUXIU S2 is more widely available through Amazon and is frequently discounted below its $79.99 MSRP. Both are 5,000mAh with Qi2 15W wireless charging.
Can I take a semi-solid-state power bank on a plane?
Yes. All semi-solid-state power banks follow the same TSA and IATA rules as lithium-ion: carry-on only, under 100Wh. Every power bank in this guide is well under that limit. Regulators have not yet created separate rules for semi-solid-state chemistry, but the reduced fire risk aligns with the direction airline safety standards are moving.
What is the difference between Qi2 and MagSafe-compatible?
Qi2 is a certified wireless charging standard that guarantees 15W magnetic charging. "MagSafe-compatible" without Qi2 certification typically means 7.5W, half the speed. The Statik State 5K, for example, is MagSafe-compatible at 7.5W. All three BMX SolidSafe models are Qi2-certified at 15W.
How long do semi-solid-state power banks last?
Semi-solid-state cells generally handle thermal stress better over time than conventional lithium-ion. Standard lithium-ion power banks typically maintain 80% capacity for 300 to 500 cycles. Semi-solid-state cells are expected to exceed that, though actual lifespan depends on usage patterns, heat exposure, and cell quality. Look for brands that publish independent cycle-life testing, not just marketing estimates.
What is the thinnest semi-solid-state power bank?
The BMX SolidSafe Air 5K at 6.8mm is the thinnest semi-solid-state power bank available in 2026. It is also the thinnest Qi2-certified magnetic power bank of any battery type, according to Macworld testing. No other semi-solid-state power bank on the market is under 10mm.
Is semi-solid-state the same as solid-state?
No. A fully solid-state battery uses zero liquid electrolyte. A semi-solid-state battery greatly reduces liquid content but does not eliminate it. Every power bank in this guide is semi-solid-state, not fully solid-state. Fully solid-state batteries for consumer electronics are still in the research phase.
Sources
- Macworld: BMX SolidSafe Air 5K Review
- Macworld: Statik State Power Bank 5K Review
- Macworld: KUXIU S3 25W 10K Review
- MacRumors: KUXIU S2 Review
- Tom's Guide: BMX SolidSafe - Game Changer for Smartphones
- Techlicious: BMX SolidSafe Air Review
- 9to5Toys: CES 2026 - World's Slimmest Semi Solid-State Power Bank
- GlobeNewsWire: Momax Semi Solid-State Power Bank Announcement
SolidSafe Power Banks
Semi-Solid-State. Titanium Build. Qi2 Certified.
Three models, one platform. Air 5K for ultra-thin. SolidSafe 5K for features. SolidSafe 10K for all-day capacity.
See All SolidSafe Power Banks
Leave a comment
This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.