In wheel chair applications I can understand why the manufacturer and end user both would elect not to have one because someone may get stuck with no power to move when they needed to. This is a case where low power is better than no power but this is detrimental to the life of the batteries. Discharging batteries too deeply will shorten the life of the battery and can cause premature failure. Sealed lead acid batteries do not have a memory and should be recharged after every use. Most manufacturers recommend that you never leave a sealed acid battery in a discharged state for longer than 48 hours.
In the case of wheel chairs it may be a safety issue to not have the low voltage disconnect built in but in most other cases it is simply a cost issue. Manufacturers of products like lawn mowers, electric golf bags, kid’s toys, flash lights and other products would lose a competitive edge with this cost increase and most would simply blame the quality of the battery when it fails.
Common batteries used in wheel chairs vary in amp hour. Typical amp hour ratings are anywhere from 35AH – 50AH. Many people bound to wheel chairs have found that Gel batteries will give longer life if used properly but the AGM (Absorbed Glass Matt) batteries are less expensive in general and many who do not rely solely on their wheel chair may choose the less expensive option that can perform just as well in many cases if properly used.
Common AGM 12V 35AH batteries used in wheel chairs are;
Universal battery UB12350, PowerSonic PS-12350, Rhino battery SLA33-12, CSB battery GP12340, Mk Battery MU1-SLDM, these are great general purpose batteries that are competitively priced. CSB also make specialized batteries for electric vehicles and cycle use such as the EVX12340 and the EVH12390 that is a 12V 39AH battery. MK batteries are also more geared for cycle application and we have found them to work very well in these applications.
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