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43 F45 Issue 6
Batteries and charging
7. Lots of start/stop driving.
8. Also thick pile carpets within the
home can affect range.
All this technical information may
seem complicated and a little
daunting, but please remember,
that the battery sizes available on
each Sunrise Medical product
should give sufficient range to cope
with the majority of customer’s
lifestyles.
Myths and legends
Over the years, battery technology
has moved forward but,
unfortunately, some of the advice
given on battery care has not. This
has resulted in a number of
confused and at times contradictory
instructions on the ‘best’ way to
care for your batteries. This section
will help to dispel some of these
myths and legends.
1. Batteries can be charged
immediately after use. You do
not need to allow them to cool
prior to charging.
2. Mobility batteries do not develop
a memory from using a repetitive
charge and discharge cycle.
This only applies to nickel
cadmium batteries commonly
found in products such as
camcorders.
3. Batteries when new do not
require any special attention with
regard to their charge and
discharge cycle. Following the
relevant ‘care plan’ is the best
advice we can give.
The range of your vehicle
Most manufacturers of mobility
products state the range of their
vehicles either in the sales
literature or within the Owners
Manual. The range stated
sometimes differs from
manufacturer to manufacturer even
though the battery size is the same.
Sunrise Medical measure the range
of their vehicles in a consistent and
uniform manner, but variances still
occur due to motor efficiencies and
overall product load weight.
The range figures are calculated to
I.S.O. Standard 7176. Part 4:
Wheelchair Energy Consumption
Theoretical Range
This test is carried out in controlled
conditions with new, fully charged
batteries, on a level test surface
and a user weight of 75kg. The
range figures stated should be
seen as a theoretical maximum and
could be reduced if any single, or
combination, of the following
circumstances occur:
1. User weight heavier than 75kg.
2. Batteries whose age and
condition are less than perfect.
3. The terrain is difficult e.g. very
hilly, sloping, muddy ground,
gravel, grass, snow and ice.
4. The vehicle climbs kerbs
regularly.
5. The ambient temperature is very
hot or very cold.
6. Incorrect tyre pressures in one
or more tyres.