12V Lead-Acid Battery Capacity Tester, Resistance Estimation Method
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Prices updated: 13 Oct 2026
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About this product
A tester for estimating the capacity of 12V lead-acid batteries using the resistance estimation method. The discharge current is set by a load resistor chosen with Ohm's law from the battery voltage and the expected current. It is intended for hobbyists and technicians who want a practical check of battery condition.
Specifications
- Battery type
- 12 V lead-acid
- Test method
- Resistance estimation (load resistor)
- Maximum test current
- 3 A (per listing guidance)
- Example load resistor
- 6 Ω, 50 W (for 2 A at 12 V)
Frequently asked questions
Can I test 18650 lithium cells with it?
The listing title mentions 18650, but the content is written for 12V lead-acid batteries. Do not use this method on lithium cells unless you verify the method and limits suitable for their voltage and chemistry.
How do I choose the load resistor?
Resistance equals battery voltage divided by the expected discharge current. The resistor power rating should be at least twice the battery voltage multiplied by the expected current. For example, 12V at 2A needs about 6 ohms and 50 W.
