Circuit - Battery Tester Electronic Circuits Designed by David A. Johnson, P.E.


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Battery Tester Circuits
Designed by David A. Johnson, P.E.
Last Updated on: Thursday, January 01, 2009 06:56 AM

Master Category List - Dave's Circuits

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.

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.

Small Battery Capacity Tester
The only truly accurate way to measure the current capacity of a battery is by connecting the battery to a constant current load and measure how long the battery can sustain that current before its voltage drops below a recommended “cutoff” point. The circuit below is designed to do this type of test.....

More Battery Tester Circuits

Master Category List - Dave's Circuits