The DIY lithium battery charger circuit is working based on an op-amp of LM358 IC. Lithium-ion batteries are very powerful and compact in size, which is very useful in today’s electronics. Connected 3v lithium-ion batteries in series will produce a high voltage with less size and easy to transport. The lithium-ion batteries are different than the lead-acid and nickel-cadmium batteries.
Circuit Diagram
The charging is also different than the lead-acid batteries. The 3.9v Lithium-ion batteries need 4.2 v of charging voltage and 1A charging current. The charging time is about 2-3 hours. if the optimized charging is not done, the battery will be damaged or reduce the battery capacity.
The proper voltage and current are needed for the proper charging of the battery. in this circuit, IRF9540 P channel mosfet controls the charging voltage. When the charging voltage exceeds the pre-determined voltage the MOSFETs get turned off and disconnect from charging. while charging the red LED starts to blink and turn off when the battery is fully charged.
can i use 5v from phone charger?
THANKS
you are welcome
what is the in put voltage in this circuit tel me bos
6v
can i use 5v from phone charger?