As mentioned earlier, batteries come in all
shapes and size, from types no larger than
a shirt button, to a battery system filling
an entire room.
To find the size of battery you require you
generally need two pieces of information,
battery load and back-up times. (Note: other
factors may also have an effect).
Battery Load
Whether you power lights, motors, electronic
equipment or a toy vehicle you equipment will
draw a load in AMPS. If this is unknown then
the equipment will have a rating expressed
in Watts which may simply be converted to
Amps by dividing the value by the normal voltage
of the system.
Back-up Time
This is the time you require the battery
to support the load described above and is
often called Autonomy or discharge time.
Example: To power a cordless electric tool
for a total of 3.0 hours before recharging.
With these two pieces of information use our
selection graph to plot an intersection point
from which you will determine a required size
or capacity in Amp. hours (Ah).
Our figure has been rationalized into rounded
figures of capacity. If your intersection
point falls between two lines choose the next
highest value.
Always choose a suitable sized battery from
the ranges appropriate to your application.
You may notice that the chosen capacity
in Amp hours is often higher than the Value
of Amps x Hours used, in our example using
10AMPS x 3 HRS = 30Ah and the chosen option
being 38 Ah. This is because the capacity
ö¿cAöÑ of each NP battery is stated at the
20 hour discharge rate. You will only get
full capacity if discharged over that length
of time.
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