Button batteries or coin cell batteries charger circuit is simple to build, must be powered up from a 9V power supply circuit and can charge up to 5 button cell batteries.
D1 is a protection diode while R1 and C1 decouple the power live of the IC1 U2401B. D3 is for protecting the batteries in case we mount them wrong. R4 limits the current at 5 mA. After we connect the adapter to the main line, the button batteries will start to charge at maximum current for a period of time, after this it will start to charge in impulses. The impulse charging it is always made at 1/10 of the maximum charging current.
R5 = 0,1 * R4
button battery charging time table
Button battery charger circuit diagram
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