- Published in issue 7/1998 on page 0
for all 1.5V and 9V batteries
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.