At the bottom of this page is a table
specifying the actual dimensions of these BCI Standard battery sizes.
We don't really need to know the actual
sizes unless you are trying to fit a different battery size than your
manufacturer specifies. Which is often possible!
My own powerchairs for e.g. originally used a group 34 battery
of 56ah. (Amp Hour capacity) As specified by the manufacturer, Sunrise medical.
But knowing the actual dimensions of a group 34 battery
allowed me to know a larger capacity group 24 battery would also fit.
How? Well that's easy! A
group 34 is the same length, and the same width as a group 24 battery. Bit the
group 24 battery is taller.
So I just looked at the space above the batteries and decided
that the taller group 24 ones would also fit.
Group 27 batteries
are around the 90 to 105Ah capacity but much longer. And heavier. Making
powerchairs too big for sensible indoor usage and very heavy. "Bounder
Wheelchairs" use these in some powerchairs. And many off road all terrain and
4x4 outdoor powerchairs use them too.
Group 22 batteries
are considerably smaller capacity (see table) and smaller sized physically too. In general group 22
batteries are good only for slow 4mph mostly indoor powerchairs and are limited
in range. If you are serious about powerchairs absolutely avoid powerchairs that
Group 34 batteries
are typically 50Ah to 70Ah and are (or can be) almost as good for range as the taller
group 24 batteries. And in certain cases better for heavy loads. A standard
automotive starter battery size case with mounting lips at the bottom. Depending on actual battery chosen***. These are
generally good in all indoor / outdoor powerchairs up to 6 mph and often used
where seat electronic riser mechanisms take the space that that the similarly
sized footprint but taller Group 24 batteries needed. Some like the Odyssey
batteries are exceptionally good.
Group 24 batteries
are taller deep cycle case versions of the group 34 ones above. They are usually 70 to
for most indoor / outdoor 6mph powerchairs are the only sensible option if Gel
batteries are used.