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Originally Posted by Christopher Jordan
Those Sears Diehards have reverse polarity, or dead cells, or some crazy relay. Started charging all 4 between 13.3V to 14.7V. 2 hours later 3 varied in the 13.5V range, but one dropped to 12.8.
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My personal experience is with Soneil chargers. They nominally charge constant-current to 14.4V and then float to 13.8V.
Quote:
I am getting to the point of buying 5 Diehard chargers, put them in 1 box (like an octopus with wires instead of legs; and charging all 4 (48V to 56V) at once, instead of spending a whole day charging. 
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If you do that make SURE that the chargers are isolated. Check for continuity between the output and input leads, and if there is, it isn't isolated. Non-isolated chargers CANNOT be used in series or else you get blown fuses and general ugliness.