Molicel’s INR-21700-P70X Cell Aims to Bridge Li-ion and Supercapacitors
New PX-series cell offers 7,000 mAh capacity, 340 Wh/kg energy density, and a sub-200-microsecond peak-power response time.
Battery cell maker Molicel has introduced the INR-21700-P70X, the first cell in its new PX series, which the company designed to close the gap between lithium-ion batteries and supercapacitors.
What Happened
The INR-21700-P70X has a capacity of 7,000 mAh and a specific energy of 340 Wh/kg, and it supports continuous discharge at 30C. Molicel rates peak power at 900 W for five seconds and says the cell can switch to peak power output in under 200 microseconds, a response time it compares to a supercapacitor that lets a vehicle handle high-frequency power pulses without fading.
Molicel is aiming the cell at the hybrid market. Hybrids approached a 20% share of new vehicle sales in the US in 2025, according to CNBC, and captured a 24% market share in Europe, based on International Council on Clean Transportation data.
To mimic hybrid duty cycles with rapid, shallow fluctuations, Molicel tested the PX series under a supercapacitor-like profile (+10C for 10 seconds / −2C for 110 seconds, 83° C cut-off) and says the cell retained 96% of its capacity after 1,000,000 cycles.
Molicel also says the cell passed UL9540A thermal runaway evaluation, that a single-crystal material cuts exothermal heat release by nearly 50% compared with conventional poly-crystal materials, and that its cells smoke rather than venting all at once, which delays and isolates thermal spread. The same containment behavior is valued in data center battery backup units.
Why It Matters
In a hybrid, the company says, the cell's fast response allows immediate current delivery during overtaking and power absorption during heavy regenerative braking. By blending supercapacitor-like responsiveness with lithium-ion energy density, Molicel aims to redefine what hybrid powertrains can achieve in terms of raw power, safety, and lifespan — while also offering thermal containment benefits for data center backup applications.
The Bottom Line
Molicel's INR-21700-P70X is positioned as a high-power, durable cell targeting hybrids, with claims of rapid response, long cycle life under shallow cycling, and improved thermal safety characteristics.
