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Companies

Proper Voltage

Battery control software for swapping in new chemistries

Raised to date

$25M

of $28.5M offered across 2 Form D filings

Still open
$3.5M
Investors
42
Last filed
May 27, 2026

About

Proper Voltage (formerly ZapBatt) builds a Battery Operating System (bOS) that acts as a universal control layer between advanced battery chemistries and the power systems they go into. The bOS handles voltage adaptation, real-time optimization, and chemistry-specific management so manufacturers can adopt sodium-ion, lithium titanate (LTO), lithium-silicon, and niobium-titanate cells without redesigning or recertifying their products. The company targets critical power, defense, robotics, and data center applications and is based in Carlsbad, California.

A chemistry-agnostic integration layer that lets emerging battery chemistries drop into existing product designs at existing voltage standards, avoiding the redesign and recertification cycle that normally blocks their adoption.

Funding

$18.5M round, first sold Feb 2019$18.5M sold20202025
Now
  • EquityFiled May 27, 2026Form D
    $6.5M/ $10M
  • Security to be acquiredFiled May 27, 2026Form D/A
    $18.5M/ $18.5M

Product

Battery Operating System (bOS)

Battery management system

A software-driven control layer that sits between battery chemistry and the end product, adapting voltage and managing the pack so any supported chemistry can work in any product without a redesign.

  • Universal chemistry adaptation across sodium-ion, LTO, lithium-silicon, and niobium-titanate cells
  • Voltage adaptation to existing product power standards
  • Real-time energy optimization and safety management

Built for

Product manufacturers integrating advanced batteries into existing designs, and battery producers seeking new markets without custom cell formats

People on file