I also think that ALL Sealed Lead Acid 12 volt 7.5 ah Batteries are the same size?
Isn't' the physical size of the cells something to do with the power in the battery?
David
Is this right too Jeff
Sorry Dave I never read that bit :
12V 7.2 Ah at 20HR Rate
Length 5.95 in.
Width 2.56 in.
Height 3.71 in.
F2 Terminals (1/4" wide)
The 8.2 Ah has the same dimensions as the above.
A battery is simply a number of cells connected together with a given voltage and capacity. The more cells the higher the voltage, the larger the plates the higher the capacity (in general).
Purely for convenience, batteries are made in 12 volt blocks with 6 cells but are also available in 6 volt, 4 volt and even 2 volt, single cell blocks.
Batteries can be connected in series to achieve whatever voltage is required (add the number of 2 volt cells) and in parallel to achieve the capacity required (add the capacities of each parallel battery or string of batteries) For larger systems, a number of series connected strings maybe connected in parallel with each other. This achieves both a higher voltage and capacity. phew!
Under normal operating conditions, four or five years of dependable service life can be expected in stand-by applications, or between 200 and 1000 charge/discharge cycles depending on the average depth of discharge.