Conrad Course material 10127 14 years and over 10127 Manual De Usuario

Everyone knows it: You have rechargeable batteries for many different uses in your 

drawer, but you do not know how much charge they still have. This is particularly 

important when using several rechargeable batteries. An electronic device will only 

work if all of them are sufficiently charged. Only measuring voltage will tell you little 

about the „charge capacity“ of a rechargeable battery.
Fig. 044 shows a simple rechargeable battery tester with a rotary coil instrument 

and a light bulb (1.5 V) as load resistor – the benefit of the light bulb is that it 

provides a good visual signal indicating the rechargeable battery‘s performance 

capacity. 
The alternative to the glow bulb is a load resistor or 10 Ω. The load current for the 

rechargeable battery is then approx. 150 mA. 

 
Fig. 044: Simple rechargeable batte-

ry tester (self-made test unit) for AA 

and AAA rechargeable battery cells 

with rotary coil instrument and glow 

bulb (1.5 V) as load resistor

Subsequently, rechargeable battery status test circuits for nickel-zinc cells are 

presented.