You really want a good charger -- the batteries will last a lot longer. I use
the Battery Tender line (http://www.batterytender.com ). These don't do seperate
voltages, though. Not cheap, but it'll pay for itself pretty quickly.
(Replies: cleanse my address of the Mark of the Beast!)
I use a lot of gel cell batteries, mostly 6V but some 12V & even some
2V. While an expensive charger is needed for some battery
technologies, SLA is not one of those. One of the main reasons that I
stick with SLA technology for my applications is that it is easy to
charge & very forgiving of abuse.
I use the smallest, cheapest 6V/12V motorcycle battery chargers that I
could find at my local auto parts store, at a cost of about US$15
each. I often charge several batteries at once, wired in series,
parallel, or some combination so as to get a convenient voltage that
matches the charger. My chargers deliver 1A, so I leave my batteries
on the charger 1 hour for every AH for which the total collection on
the charger is rated.
I always charge only IDENTICAL batteries together, never mixing brands
or even models of the same brand. The result has been many years of
reliable use at minimal cost.
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