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[HELP] Build Automatic Cut off Charger for 7.4 Volts Battery

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darrylcapulla

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Hello, can anyone help me build Automatic Cut off Charger or
Smart Battery Charger for 7.4 Volts - 2 x 3.7volts Lithium Polymer Battery 3500mah.

Charger will automatically turn off when its 8.2volts(safe voltage) or 8.4 volts - fully charged.

I try to search from the internet,and i found this one.
when i simulate it, output voltage is 8.2 volts.
I don't know if this charger is good or not, should i use this one?
please, help. thanks

Capture.JPG
 

The charger circuits you found are for charging an old fashioned lead-acid battery.
Modern Lithium battery chargers use balanced charging of each cell to avoid overcharging one cell and causing a fire.
 

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