If you are going to charge your batteries on a regular charger than by all means get a Battery hydrometer. (it looks like a turkey baster with a float inside of it). Open the caps on the batteries and suck out some acid into the tester until the float inside just starts to float. Read the color chart on the float where the fluid is and it will tell you how much your battery is charged. Shut off your charger once the float says the battery is charged and you'll have no problems using any kind of charger. Just remember that battery acid will eat your pants for lunch if you get any of it on them, so be careful and ALWAYS wear safety goggles.
For general info, I use a shop charger that charges my batteries @ 12 amps, and it has a timer built in so I never overcharge them.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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