Rechargeable batteries 9V, D, AA
Rechargeable batteries are used in a variety of devices. There
are several different types of batteries that use different
technologies for different types of devices. Three main types of
rechargeable
batteries are 9 Volt, D, or AA and also AAA. But what to
these letters mean and why are they different?
A 9Volt battery is a rectangular battery used in small consumer
electronics. Rectangular is a shape used for most batteries
which are 4 volt or higher, up to 12 volt. All batteries are
made of cells, but the cells in a 9 volt are connected in a
series combination which makes the voltage rating of the battery
the sum of the voltage of the cells.
D is another type of available rechargeable battery. It is
cylindrical and 1.5Volt. D batteries are referred to as
batteries, even though they are really just a D cell. As opposed
to the 9 volt which is several cells connected, the D cell is
simply one type of cell. D cells are used for a variety of
electronic devices.
AA or AAA batteries are typically composed of alkaline. However,
NiCd and NiMH are now available for rechargeable types and have
higher capacity than alkaline. AA and AAA are used in handheld
devices like remotes, digital cameras, model cars. AA and AAA
hold the same amount of power, but AA has more lifetime, which
is why it is larger.
All rechargeable batteries are referred to as secondary cells
because they can be charged after they are drained. 9 volt, D,
AA and AAA are all dry cell type batteries because they do not
contain the wet lead acid as in the oldest type of rechargeable
batteries. Buying quality batteries and charging them properly
is the best way to get the most out of your money.