How to Charge a Honda CT70 Mini Trail 6V Battery

How do you know its actually charging? Also, with the negative, can you set it in any metal bc it is a Negative?

Thanks for this video! Can you use a 12v charger from a motorcycle?

Thanks for the help man! Appreciate it very much.

Thank you!

Question? I have a 1969 z50 and was wondering if I could keep it on a battery tender when not in use?

is this the same way to charge a CT90 trail?