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Two 4-wire probe options for battery voltage and internal resistance testing
Keywords: SM8124A battery internal resistance tester, SM8124PLUS battery tester, battery internal resistance meter, 4-wire battery resistance tester, battery voltage and resistance tester
The SM8124A and SM8124PLUS battery internal resistance testers measure voltage and internal resistance in individual cells and assembled battery packs. They support checks on lithium-ion, nickel-metal hydride, zinc-manganese, and lead-acid batteries. Both models share the specifications below and differ in probe design.
1. Measures battery voltage from 0 to 100.0 V and internal resistance from 1 mΩ to 19.99 Ω across multiple ranges.
2. Tests individual cells and assembled batteries, including lithium-ion, nickel-metal hydride, zinc-manganese, and lead-acid types.
3. Displays readings on an LCD and provides a low-battery warning.
4. Compact handheld design weighs 177 g and runs on one 9 V battery.
Normal four wire test probes | 
Coaxial double contact four wire probes |
| Parameter | Specification |
|---|---|
| Voltage measurement range | 0–1.999 V; 2–19.99 V; 20–100.0 V |
| Voltage resolution | 1 mV (0–1.999 V); 10 mV (2–19.99 V); 100 mV (20–100.0 V) |
| Voltage measurement accuracy | ±1% |
| Internal resistance measurement range | 1–199.9 mΩ; 200–1999 mΩ; 2–19.99 Ω |
| Internal resistance resolution | 0.1 mΩ (1–199.9 mΩ); 1 mΩ (200–1999 mΩ); 10 mΩ (2–19.99 Ω) |
| Internal resistance measurement accuracy | ±5% |
| Display | LCD |
| Low-battery indication | Yes |
| Power supply | One 9 V battery |
| Operating environment | 0–40°C; ≤85% RH |
| Dimensions | 130 × 72 × 30 mm |
| Weight | 177 g |
1. Battery voltage and internal resistance checks during inspection, maintenance, and quality control.
2. Testing battery cells and packs with the SM8124A standard probe or the SM8124PLUS probe for small terminal tabs.