Lead acid, be they deep cycle or not, batteries of 6 cells each 2.1 volts should equal 12.6 volts fully charged subject to temp variations.
A while back I asked on here about good brands of deep cycle chargers, LJD and others offered some opinions and I did some research, the so called smart chargers use an initial bulk charge rate plus an absorption charge and then the more expensive units like Xantrexo have the equalization charge rate of 15 to 16 volts which supposedly allows for removal of any remaining lead sulfate on the plates.
Even if the cheaper are referred to as smart chargers I dont think they have an automatic equalization mode and instead you have to manually set them to a real high 15 to 16 volt range and stop once they outgas excessively otherwise you can damage the plates and/or boil them over.
Schumacher (spelling??) and Xantrex seem good and were recommended by LJD and other here but those are pricey when you get to the higher amp rated units. They have some Xantrex 10 amp on Flea Bay but with my 375 amp hour RV battery bank they recommended at leat a 40 to 50 amp charger and those sizes in a true 3 starge smart charger with Bulk and Absorption and Equalization are EXPENSIVE but so are 3 or 4 true deep cycle batteries also so if you greatly extend their life it may pay off to get a high quality deep cycle charger???
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