Arctic-Grade Battery Systems
Mission-Critical Power at -40°F
Sodium-ion battery packs that retain 90% capacity at -40°F. Purpose-built for defense operations in extreme environments.
The Solution
The POSH Arctic Battery Pack
A military-grade sodium-ion battery pack with integrated thermal management, delivering 175 Wh/kg energy density and 90% capacity retention at -40°F. The arctic camouflage enclosure is IP67-rated, field-portable, and built for the demands of extreme-cold military operations.
Inside the Pack
Thermal Management System
Sodium-ion cells paired with a proprietary thermal package deliver full performance at -40°F.
Insulated Enclosure
Highly insulated multi-layer enclosure minimizes heat loss at extreme temperatures
Resistive Self-Heating
Embedded heating pad/foil provides uniform, rapid cell warming
Preheat Mode
Automated pre-conditioning before heavy discharge cycles
Keep-Warm Standby
Low-power trickle heating maintains readiness during idle
Technical Data
Full Specifications
Every detail engineered for reliability in the harshest conditions on the planet.
Product Gallery
Competitive Advantage
Why Posh Energy
Deep technical expertise combined with rapid execution to deliver power solutions that meet the demands of military operations.
Deep Expertise
Stanford PhDs and industry veterans with decades in advanced battery design and thermal management.
Custom Engineering
Proven custom battery designs for immersion cooling, extreme temperatures, and mission-specific requirements.
Rapid Deployment
Modular designs enable fast scaling and simple field integration with existing military systems.
Full Lifecycle Support
End-to-end support from design and prototyping through production, deployment, and recycling.
Government-Ready
Fully registered and compliant for federal contracting — CAGE Code, DUNS, UEI, MBE certified.
Y Combinator Backed
$5M in venture funding. Backed by Y Combinator with proven track record in energy innovation.
Get Started
Ready to power your mission?
Posh Energy is ready to engage with the U.S. Army to discuss requirements, provide samples, and begin the qualification process for arctic-grade battery packs.