Replacing lead acid battery with Lithium Ion battery

[vinaytej445]

I wish to replace my electric wheelchair's lead acid battery 24V 12AH with Lithium ion battery. Please guide if I may face any problems? If yes What would be the ideal voltage for long endurance usage

 

[D.A.(Tony)Stewart]

The ideal voltage must be in the yet to be defined controller range.

Then the ideal state of charge SoC is to use no more than 50% between slow charges preferably 80% to 30%. Preventing Fast charge and deep cycles can increase the cycle count 100x using this protocol. Ask suppliers who know about how to get this with a SOC gauge and charger settings or modifications.

 

[BradtheRad]

By putting heavy L-A batteries near the wheels a wheelchair has a lower center of gravity. It's more stable. Less likely to tip cornering or on steps or on sloped walkways.

Lighter weight batteries give you faster speed, greater mobility for anyone lifting the wheelchair.
Question: Have you seen other people saying they're glad they installed Li-Ion batteries?

 

[KlausST]

Hi,

I´m the person doing reliable stuff. Thus I´d first need specifications and requirements .. then I´d do the math and the verification according datasheets.

So like load current, if pulsed: then peak current, frequency, waveform...
and also whether you want/need to use the same charger, and if yes: what it´s charging method, threshold voltages, currents.. and so on.

Li-Ion batteries are much more critical .. and on mistreatment they may die way too early or even explode and cause fire.

Klaus

 

[dick_freebird]

There exist Li "12V" standard form batteries meant for this. The charging, I do not see so ala carte I reckon.

Electric wheelchairs I have taken apart, use 2 x 12V standard looking SLA batteries. I think you stand a good chance of finding suitable size (and size for size, Li should win big).

If CoG is affected, iron plate Is cheap.