Portable Battery Internal Resistance Tester 1uΩ-200Ω ±100VDC 0.5% Accuracy 1kHz AC Kelvin 4-Wire Clip for Lithium Lead-Acid NiMH

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Product Description

• High-Precision Measurement: 0.5% accuracy, 1μΩ～200Ω resistance & 0.0001V～100V voltage, 4-wire Kelvin clips for error-free results.
• Versatile Function: Kalman Filter algorithm, compatible with Li-ion, lead-acid batteries, supports live testing (e.g., UPS/electric vehicles).
• Portable Design: 173.5g lightweight, backlit LCD, 1000mAh built-in battery (5V Android charging), auto-shutdown in 20 minutes.
• Complete Package: Includes tester, 1m clip-type test leads, manual, ready to use.
• Reliable Service: 6-month warranty, professional support, storage temp -20℃～80℃ for harsh environments.

Critical Product Specifications

Frequently Asked Questions (FAQ)

Q: Zero adjustment issue?
A: If the two clips are shorted but the reading is not zero (e.g., shows x.xxx mΩ), this is normal. Only when the clips are perfectly connected will the minimum value (close to zero) appear. Non-zero readings do not affect accuracy, as the internal program automatically calculates the theoretical zero point. No manual zero calibration is required.

Q: Should the battery be fully charged before testing?
A: Battery state (fully charged or depleted) does not affect internal resistance measurement. The internal resistance changes minimally (except for defective batteries).

Q: Why are measurement results unstable or inaccurate?
A: Fluctuations may occur due to:

• Poor contact between clips and battery terminals.
• Unstable battery voltage or oxidized electrodes.
• Strong magnetic interference nearby.

Q: Why is the measured resistance higher than the battery’s actual internal resistance?
A: When testing high-capacity batteries (very low internal resistance), ensure proper clip placement and contact. The resistance of battery terminals or connecting wires may exceed the battery’s internal resistance.

Q: Can this device test [XXXX] batteries?
A: Yes, it supports all battery types, including lithium-ion, lead-acid, Ni-Cd, dry cells, etc.

Q: How does internal resistance indicate battery health?
A: As a battery ages, its capacity decreases and internal resistance increases. Lower internal resistance indicates stronger load capacity and slower aging (higher quality).

Q: What is the typical internal resistance of an 18650 battery?
A: New 18650 Li-ion batteries:

• High-quality: ~20 mΩ
• Average: ~30 mΩ
• Low-quality: >50 mΩ

Q: What battery capacities can it test?
A: Any capacity, as long as internal resistance is 0-200 mΩ and voltage ≤100V.

Q: Can it perform live testing (e.g., UPS batteries)?
A: Yes, it supports live testing without interrupting battery operation.