Batteries and energy cells lose their capacity as they age. If a cell or battery’s capacity is too low, your equipment may also soon stop working. You can use the circuit in Figure 1 to measure a ...

For 45 years, nickel-cadmium (NiCd; also Ni-Cad™, see Editor's Note below) batteries have plagued me. That's because I like to spend my Sunday afternoons relaxing with radio-controlled aircraft, such ...