- Published in issue 5/1998 on page 48
for all kinds of battery
A measurement of the e.m.f. of a battery (dry or rechargeable) does not say anything about the condition of the battery or its constituent cells. To obtain a useful indication of that condition it is necessary to measure the battery voltage under load. The circuit described in this article allows this to be done readily, and goes even further since it enables the extent to which the battery is able to follow rapid changes in the load to be monitored.