For lead acid batteries I have had great luck with the Battery Tender
chargers (google for them). These are terrific lead-acid chargers. REGIS
(link at bottom) has had the same two batteries literally for years, and
it runs around 12-14 hours/day. The electronics battery is charged
nightly, and the main motor battery monthly.
The only problem is that you'll need two chargers -- one for 6 volts and
one for 12. Over the long run, however, I found that moving to a
high-quality charger saved me both time and money. Note that you may
find your life simplified anyway if you settle on a single battery
voltage, rather than two. Consider dumping the 6v.
Hope that helps -- tAfkaks
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