Battery Tester Electronic Circuits


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Battery Testers
Last Updated on: Friday, August 29, 2008 02:32 PM

Circuits Designed by Dave Johnson, P.E. :

6v NMH/NiCd Battery Tester
I designed this circuit to test rechargeable six volt battery packs under constant current conditions. As designed, the circuit applies a 10 amp load to the battery pack. A heat sink must be used on the main power transistor. (added 12/04)

Button Battery Cell Internal Resistance Measurement Circuit
The open cell voltage of a small silver oxide button cell battery remains very close to 1.5 volts over most of the life of the cell. However, there is a relationship between battery health and the internal resistance of the cell. This circuit when used in conjunction with an oscilloscope will measure the internal resistance. You will have to use a known good cell as a reference.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Battery Characterizer: (Electronic circuit added 4/05)

Battery Simulator Provides Current Limiting : 08/01/97 EDN Design Ideas / (added 5/03) A constant-voltage active load can perform as a battery during the charge cycle. You can set the load voltage from 5 to 35V by using potentiometer PV and thus can simulate batteries ranging from 6 to 32V.

Constant Voltage Load Tests Battery Chargers: 04/11/96 EDN-Design Ideas / (added 6/06)

LED Battery Condition Indicator: (Electronic circuit added 4/05)

Phantom Power Battery Test Circuit: LED will light when battery is over42 volts (added 3/03)

Self-Powered Fast Battery-Tester: Tests 1.5 to 15 Volt cells. Two-LED display, no power supply required (added 3/05)

Simple car battery tester: This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every.... (added 2/07)

Test Batteries Without a Voltmeter Part 2: 03/15/01 EDN-Design Ideas / (added 11/05)

Test Batteries Without a Voltmeter: 11/09/00 EDN-Design Ideas / (added 5/02) / PDF contains multiple circuits - scroll to find the one of interest / This circuit an easy approach to testing batteries without exiting the voltmeter. The battery holders in sizes AAA, AA, C, and D make this tester so much faster than a voltmeter.