EticaAG, a provider of immersion-cooled Battery Energy Storage Systems (BESS), has launched a pair of immersion-cooled lithium-ion battery systems for data centers.

The company recently announced the launch of its new Fortis Series of products for data centers.

The Fortis Sidecar and Fortis 400 Rack are built on EticaAG’s proprietary immersion-cooled NMC (lithium-ion) platform. The company says they are the first commercial product line capable of serving both traditional UPS systems and DC-voltage rack architectures such as OCP Diablo 400.

Every battery cell in Fortis modules is fully immersed in Shell Certified Battery Dielectric Fluid - a non-conductive, non-toxic, and biodegradable liquid.

“Fortis makes NMC viable inside the white space for the first time,” said Jaime Hidalgo, CEO of EticaAG. “With the Fortis 400 and Sidecar, we’re giving data centers two safe, scalable paths to higher power density and true operational resilience.”

EticaAG said its LiquidShield immersion cooling and HazGuard gas-mitigation technologies eliminate ignition and toxic off-gassing risks, allowing NMC cells to operate safely inside the white space. HazGuard is a ventilation system that draws flammable and toxic gases out of the container in the event of a fire.

The Fortis Sidecar connects directly to the UPS DC bus. Each unit delivers up to 233kWh per rack, >330kW continuous, and up to 600kW peak output for short-duration surges. The system provides up to 30 minutes of runtime at 80 percent Depth of Discharge (DoD).

The Fortis 400 rack delivers ≈224kWh total energy and 1.74MW continuous / 2.48MW peak power, providing 45–90 seconds of ride-through at full rack load.

All Fortis Series systems will be manufactured in the United States, with initial availability expected in Q4 2026.

Pennsylvania-based EticaAG is an OEM specializing in immersion-cooled, non-flammable battery energy storage systems for data center, commercial, and industrial applications. The company is a partnership between Taiwanese battery firm Etica Battery and AssetGenie Inc.

Matthew Ward, president of EticaAG, said: “Our goal is to combine innovation, safety, and compliance. Fortis delivers advanced NMC performance with full immersion safety in a platform designed, built, and supported in the United States.”