FNIRSI HRM-10 Battery Voltage Internal Resistance Tester

The FNIRSI HRM-10 is a high-precision diagnostic tool designed to help FPV pilots and drone builders assess battery health, identify degrading cells, and match cells for custom Li-ion packs. Unlike standard LiPo checkers, it utilises a true 4-wire Kelvin measurement method to deliver accurate internal resistance (IR) and voltage readings by eliminating test lead interference.

Key features

• True 4-wire Kelvin measurement for precision internal resistance tracking

• Broad 0-100V testing range, easily covering everything from 1S whoop cells to massive 12S+ agriculture drone batteries

• Measures resistance from 0.0001mΩ up to 200Ω to confidently identify sagging packs before flight

• Built-in rechargeable battery with USB-C charging for convenient field and bench use

• Supports PC connection via USB for historical data export, logging, and firmware updates

Specifications

• Voltage measurement range: 0–100V DC

• Resistance measurement range: 0–200Ω

• Testing method: 4-wire AC sinusoidal (Kelvin clips)

• Display: Colour LCD

• Power and data interface: USB Type-C

Whether you are maintaining a fleet of heavy-lift cinelifters, building custom long-range packs, or monitoring the health of high-discharge 6S racing batteries, the HRM-10 provides the empirical data required to determine if a pack is safe to fly or ready for disposal.