battery charger Help

[Carl-NC]

I plan to use it as charger for 4 cells (Li-Ion 3.4 v) in series.

Li-Ion requires careful charging and individual cell monitoring. You can't just slap a big honkin' voltage on them like you would a car battery.

[kt315]

https://www.youtube.com/watch?v=CP_AVUoPMIw
sometimes those russians looking crazy... this schematic went from russian...

[totob]

Li-Ion requires careful charging and individual cell monitoring. You can't just slap a big honkin' voltage on them like you would a car battery.

in post 9 jladre inserted schematic for charger, is it suitable for this purpose?

[totob]

https://www.youtube.com/watch?v=CP_AVUoPMIw
sometimes those russians looking crazy... this schematic went from russian...

yes, it is the same schematic

[jladre]

thanks for this schematic I think this is safe circuit
what serve these Variable resistors? is it for adjust the output voltage?

Yes it is safe. It is so called balanced charger which charge each cell individually...yes there is a variable resistor for each cell to adjust the output voltage. You can also adjust the current output.
Those 5k variable resistor is used to adjust the output voltage.

[Tim]

Great piece of home-made kit there! If anyone with access to Ebay wants to buy a similar thing (US$4 approx.), search Li-ion charge controller. I use it to charge 3x18650 Li-Mn's from an unregulated 12v source (or solar panel). Small enough to fit on the side of the battery holder.

[homefire]

Or you can just use one out of a old Lap Top battery like I did.

[Carlos]

I use this charguer and work very well!!!!
Carlos

[totob]

[ATTACH]37463[/ATTACH]

I use this charguer and work very well!!!!
Carlos

what is the voltage and type of battery you charge with this charger ?

[paku]

Hi everyone
I want to identify the components of this circuit (battery charger)