s? I obviously don't want to burn out my power supply, so I'm hoping
to hear from people who would

The current requirements will probably exceed the current rating of the Meade
charger. To verify this check the current specifications on the charger. If
the 6V sealded batteries are of the motorcycle type then they will require 10
to 15 amps. I use 12 V motorcycle batteries and after an evenings outing my
charging rate is 15 amps. My charger also has a 6 V charge output and was
bought from Sams outlet for about $30.