Here you can read more about charging and connecting batteries in series or in parallel -
UPS Battery SLA Battery Replacement Batteries
It depends on how you connect the batteries. If you connect the
negative of battery one to the positive of battery 2, the negative of
battery 2 to the positive of battery 3 the negative of battery 3 to the
positive of battery 4 then the positive of battery 1 and the negative of
battery 4 will give you 48v 7AH. (This is known as connecting in
series.)
If you connect the four positives together. Connect the 4
negatives together it will give you 12v 28 AH. (This is known as
parallel connection.)
If you connect the negative of battery 1 to
the positive of battery 2. Connect the negative of battery 3 to the
positive of battery 4. Connect the positive of battery 1 to the
positive of battery 3 and the negative of battery 2 to the negative of
battery 4. You'll get 24v 14AH from the connection of the positive of
battery 1 and battery 3, and the negative of battery 2 to battery 4.
(This is known as series parallel connection)
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