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Battery tester:

for all 1.5V and 9V batteries

Based on a Labs project | October 2011 | Find it here
Battery tester:
This battery tester does the job properly by evaluating the battery state under loaded conditions. The project is easy to build and contains regular components only. The battery read-out is a solidstate LED display rather than an expensive and fragile moving-coil meter. A special design feature enables the tester to make voltages below 1 volt light an LED.
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