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My observatory has been running off a Century for over a year and its still in great condition. Conversly I trashed two batteries costing twice as much each in my camper due to woeful battery management on my behalf!
Ctek make brilliant chargers, but the price may leave you breathless. With a top charger, you can leave them on charge permanently to ensure good condition. Oh, and if you never discharge more than about 50% (even with deep cycle) it should work out well.
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