Batteries and charging
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.
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.
43 | F45 Issue 6 |
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