NiCd battery capacity tester

This is an enhanced version of the NiCd-battery tester published in the July/August 1995 issue of Elektor Electronics. In that design, the NiCd battery under test is discharged at a rate of 100 mA, while it is also used to power a small quartz clock. When the resistor as drained the battery th a voltage of 1.05V, the clock stops, and the capacity (inAh) to be calclated.