Li ion cell charging from solar cell

Thread Starter


Joined Apr 28, 2020
Hello everyone
I need a help , am a beginner and now I have to design a circuit which will charge 3.7V,1000mAh li ion battery
My input will be either 5V 1 Amp DC from wall adapter or 7V,60 mA from solar cell please suggest me any IC which perform this operation.

Thank you all

Audioguru again

Joined Oct 21, 2019
Your solar cell might produce 7V with no load current and produce a maximum current of 60mA only when shorted. But if it actually produces 7V and 60mA at noon on a sunny day when facing directly into the sun then it might average only 20mA for 10 hours each day. It will charge the 1000mAh battery in 1000/ (20x10)= 5 days.

A Lithium-ion battery cell is 4.2V when fully charged and its voltage slowly drops as it is used until about 3.2V when it should be disconnected to avoid damage.
Use a lithium-ion cell battery charger IC.