Three proprietary components.
One ingenious design.

With more than 95 patents pending, published, or issued, our streamlined Eos Z3 battery module design features an aqueous electrolyte, bipolar electrodes, and a polymer casing.

Inspired by zinc plating baths

Z3 battery modules store electrical energy through zinc deposition. Our aqueous electrolyte is held within the individual cells, creating a pool that provides dynamic separation of the electrodes. During charge and discharge, ions move through the electrolyte to their respective electrode to donate or accept electrons, creating a current flow through the bipolar stack.

Inspired by zinc plating baths

Realizing the full power of zinc.

Eos Z3 modules are as high-performing and price-competitive as leading industry storage solutions in the intraday market. But our proven zinc-powered chemistry delivers significant additional operational advantages in 3- to 12-hour discharge duration applications that other technologies can’t.

Fully sealed. Long lived.

Each Z3 battery module is a self-contained unit, a closed-system design with no moving or delicate parts, so they’re as easy and cost-effective to maintain as they are to manufacture. And they can last at least 6,000 cycles—almost twice the operational life of most conventional battery chemistries.

20 years
or 6,000 cycles

Non-flammable. Non-corrosive.

Z3 modules are inherently safe to use. With a water-based electrolyte and flame-retardant polymer framing, there’s no risk of thermal runaway. When fully charged, they’re at most mildly acidic (pH 2-4 range). And even when overcharged, only negligible levels of hydrogen are off-gassed.

Certified to the
Batteries in Stationary Applications standard

High tolerance. Low degradation.

No matter what conditions our Z3 battery modules face, they keep on going—even fully recovering from 90⁰C+ abuse cycles with just a simple, short rest period—with no change to their overall degradation curve. Which, at 9% over 20 years, is well below conventional standards.

of rated capacity over product lifespan

Variable DoD. Variable duration.

Our zinc-based battery chemistry is highly tolerant of significant variation in operational requirements. A Z3 module’s storage duration can range from 3 to 12 hours, with no impact on degradation. And the maximum DoD can be reduced for applications demanding round-trip efficiency in the mid-80s.

Maximum of
Depth of Discharge (DoD)

Reliable supply. Ethical sourcing.

Z3 modules require just five low-cost, widely-used, earth-abundant commodities, that have no geopolitical issues connected to their extraction. This enables local sourcing that minimizes the risk of supply chain disruptions—and related price swings.

of materials sourced within a day’s drive

Fully recyclable at the end of their usable life, Eos batteries are a truly sustainable solution.

Fully recyclable at the end of their usable life, Eos batteries are a truly sustainable solution.

Power that stacks up.

Z3 battery modules are the building blocks of all of our ingenious energy storage systems. Our standard Z3 strings are racked in a variety of configurations to form our Eos Cube, Eos Hangar, and Eos Stack solutions.

Find out how we’re ensuring continuous innovation

Research & Development

Eos Ingenuity Lab

See how we’re building our products—and our team


Eos Ingenuity Park