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Scalable LFP power.

Aries™ I

Aries Battery


79+ kWh
348 V
Peak Power
120 kW
Cont. Power
79 kW
287 Wh/L
285 L
Volume Cell-to-Pack
76 %
144 Wh/kg
Cycle Life
3000 Cycles
1630 mm
Length with mounts
1730 mm
766 mm
229 mm
550 kg
Aries I

Perfect for class 3-6 trucks.

Aries I delivers 150 miles of range on a single charge without nickel and cobalt. Using lithium iron phosphate (LFP) chemistry and innovative design, Aries I offers procurement managers compact power that is safe, durable and scalable. It delivers 3,000 cycles and allows daily charging up to 100% without degradation. And Aries I is built with abundant raw materials, so global supply issues are unlikely to slow production.

Already in production.

Aries I is produced in Michigan for ONE by Piston Automotive on a dedicated product line.

Piston Line
Piston Line
Aries I at Piston
Piston Line
Piston Line Closeup
Piston Line Closeup

More miles, less space.

By using LFP chemistry, Aries I makes larger cells possible while taking advantage of structural housings for load transfer. With more range and greater efficiency, Aries I unlocks thousands of new routes for emission-free fleets.





Aries Battery Exploded

Safer chemistry.

Our safer LFP chemistry massively reduces the risk of thermal runaway.

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Sustainable supply.

Nickel and cobalt are expensive, and prices can fluctuate wildly. Aries I uses LFP chemistry, so it’s safer, lower in cost and made from more abundant materials like iron.



Cell–to–pack energy density.

Structural Cell-to-Pack™ architecture allows 76% system-level energy density in a compact format.

Aries I Cover
  • Simply scalable.

    Scalable architecture allows for series and parallel configurations. So Aries I can power a wide range of applications, from trucks and boats to homes and grids.

    Aries Applications

Aries I is road-tested.

In partnership with Motiv, our Aries I LFP pack powered a class 5 truck with a 3-ton payload 150 miles on a single charge.

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Aries I
Aries I Detail

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