The FNIRSI HRM-10 is a handheld battery tester that measures both internal resistance and voltage.
Internal resistance reveals battery health in ways that voltage alone cannot.
HRM 10 Measure Internal Resistance?
A battery can show good voltage but still perform poorly under load.
High internal resistance means the battery cannot deliver current efficiently.
It causes voltage drop, heat and reduced capacity.
Measuring internal resistance tells you how healthy a battery really is.
True Four-Wire Measurement
The HRM-10 uses a four-wire (Kelvin) measurement system.
This eliminates the resistance of test leads from your reading.
You get the true internal resistance of the battery, not the resistance of your cables.
Essential for accurate low-resistance measurements.
Voltage Measurement
Range: 0 to ±100V DC
Settings: Automatic, 1V, 10V, 100V
Test single cells, battery packs and higher voltage assemblies.
Covers common lithium, lead-acid and NiMH batteries.
Resistance Measurement
Range: 0 to 200Ω
Settings: Automatic, 20mΩ, 200mΩ, 2Ω, 20Ω, 200Ω
From milliohms for healthy lithium cells to higher values for degraded or specialty batteries.
Accuracy
±0.5% accuracy for reliable, repeatable results.
Trust your readings when assessing battery condition.
Sorting Mode
Set your own pass/fail thresholds for resistance and voltage.
The HRM-10 automatically categorises each battery as good or bad.
Speeds up batch testing significantly.
Sort large quantities of cells for matching or quality control.
Historical Records
The tester stores past measurements.
Review previous results without writing them down.
Export data tables for further analysis or record keeping.
Track battery degradation over time.
User Calibration
Adjust calibration to suit your specific testing requirements.
Maintain accuracy over the life of the instrument.
Rechargeable Battery
Built-in 1000mAh lithium battery.
Charges via USB Type-C (5V/1A).
Portable for use anywhere.
No mains power needed during testing.
Clear Display
Measurement results shown clearly on screen.
Voltage and resistance readings easy to read at a glance.
Compact and Portable
Dimensions: 158.7 × 80.5 × 28.4mm
Weight: 225g
Fits comfortably in your hand or toolkit.
Take it to the workshop, storage area or field site.
Operating Conditions
Working temperature: -10°C to +45°C
Storage temperature: -20°C to +80°C
Humidity: less than 80% RH
Suitable for most workshop and field environments.
What’s in the Box
- FNIRSI HRM-10 main unit
- Four-wire clip test leads
- USB Type-C data cable
- User manual
Who Is This For?
Battery pack builders matching cells for performance and safety.
Electric vehicle enthusiasts checking cells for e-bikes, scooters and conversions.
Solar and off-grid users monitoring battery bank health.
RC hobbyists testing LiPo packs before use.
Repair technicians diagnosing battery issues in devices and equipment.
Recyclers and resellers sorting used batteries by condition.
Anyone who needs to know more than just voltage.
Practical Uses
Cell Matching
Match cells by internal resistance for battery pack building.
Balanced packs perform better and last longer.
Battery Health Assessment
Identify cells that are ageing or failing.
Replace weak cells before they cause problems.
Quality Control
Test incoming cells before assembly.
Sort out substandard units.
Maintenance and Monitoring
Track internal resistance over time.
Spot degradation before batteries fail in service.
Troubleshooting
Find the weak cell in a pack causing performance issues.
Diagnose why a device isn’t holding charge.
Sorting Used Batteries
Assess second-hand or salvaged cells quickly.
Separate good cells from recycling candidates.
Fast UK Delivery
Orders ship from our UK warehouse within 1-2 business days.
No long waits. No customs delays.
60-day returns and 12-month guarantee.
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