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Battery Testers
Last Updated on:
Sunday, June 28, 2009 05:56 AM |
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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) |
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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. |
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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..... |
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