Step 1: stuff I used
Viral News Boy :- DC to DC step down converter
DC to DC step down converter
It will convert 19volts from your charger to 14volts to charge the battery.
It will provide constant voltage and constant cuttent.(Very necessary).
It comes with 3 indicators led(red, blue, and green), red show constant current, blue show load and green show constant voltage “full charge”
Step 2: prepare the adapter
Cut down the jack of the adapter
Remove the outer shield with a blade ( carefully)
You will see 2 wire red and black, black is negative while red is positive (see the image).
Step 3: connection
The red wire of adapter will go to “IN+” positive of the board(see the image)
The black wire of adapter will go to “IN-” negative of the board.
Light the screw terminal with a screw driver
Now connect alligator clip
Red alligator clip will go to “OUT+” positive of the board(see the image)
Black alligator clip wire will go to “OUT-” negative of the board.
Step 4: configuration
Plug the power to the adapter
Connect the black alligator clip to negative lead of multimeter and red alligator clip to positive lead.
Test it and your good to go 👍