A simple lithium-ion battery tester. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Chargers, batteries, galvanic cells
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Lithium-ion batteries are sensitive to operating conditions. Severely discharged batteries can cause a fire or explosion when charged with simple chargers without automatic controls. Modern chargers allow you to safely charge and discharge batteries while providing the required current. But before charging, you should check the condition of each battery. In most cases, it may be sufficient to replace one or more dead batteries.
The figure shows a diagram of a simple battery tester:
When the voltage of the battery under test is lower than 2,6V, then the base current is not enough to open the transistor, while LED 1 is on, LED2 is off, If the input voltage is greater than 2,6V, current flows through the base of the transistor, LED2 is on, open the transistor shorts out LED1.
The limit voltages depend on the type or color of the LEDs used. A standard red LED has a forward voltage drop of about 1,7V, a green LED is about 2,1V, and white or blue LEDs are 3V. The battery tester uses red LEDs with a forward voltage drop of approximately 1,6V at 2mA.
Using resistors with a lower resistance leads to an increase in the brightness of the LEDs, but the supply current increases.
Author: F. Weld
See other articles Section Chargers, batteries, galvanic cells.
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