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Hi Beren,
For years I've been using an inexpensive 2 amp trickle charger - nice & slow! Sure, it takes all day & night to charge my 38 amp/hr battery, but I hear it's good to charge these batteries slowly.
Like Photon says below, maintenance is key, and that means "exercising" the battery by using it (ie discharging it) and recharging it at least once on a monthly basis.
Cheers,
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