I've got a 6v motorcycle battery that I need to charge, but my current battery charger is only for 12volt car batteries.

Now if my memory serves me right I can adapt this charger by creating a lead between positive and negative with 2 resistors of of the same value, then taking power for charging from between the 2 resistors, which should be 6volts. 

Am I correct here? Or have I just made this all up.

Wait a minute, I think I may have slipped up and this is a 12v battery anyhow.

Well charged it today, seems to have survived ok.

Just out of interest, would my originally proposed idea have worked for a 6v battery?

2 hours ago, R_U_AFA said:

 

Just out of interest, would my originally proposed idea have worked for a 6v battery?

 

With just the resistors in place you'll measure 6v between the resistors but introduce a  load(battery!)  then it all changes.  Voltage drop more determined mainly by V=IR over the first resistor where the current drawn will be determined by current through the second resistor and drawn by the battery.

 

Something like this will do the job... https://www.amazon.co.uk/EBILUN-Converter-Voltage-Changer-Regulator/dp/B07HCC8C6Z

 

Edited 11 March, 20242 yr by bigjohn

Thought my way seemed way too easy.