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I am wondering how you know the batteries are good?
Many problems are battery related and it is important never to assume anything about battery condition before moving on to further checks.
It is important to check the terminal voltage under load before declaring a battery is good - even the ancient and relatively crude technology of lead acid batteries can fool even modern chargers and the sealed gel-type batteries have a reputation of suddenly failing without warning.
Operate the chair until it almost stops and check the voltage while keeping the load on.
While it is possible one motor might give trouble it is most unlikely two will give the same trouble at the same time. Controllers do give trouble sometimes but usually they either work or don't work...
Surely the vented type is the regular battery?
To the best of my knowledge both the wet type battery and the gel type battery are both vented and interchangeable, though the gel battery is often considered a sealed type they do generally contain an array of valves to allow the escape of gas..
Both offer advantages over each other with the wet type battery being the traditional fitment for motor vehicles. Gel type batteries have a history of variable reliability with the main advantage being the danger of spilled acid is removed they can be fitted in positions a wet battery would be unsuitable for.
If in doubt refer to the battery manufacturer's application catalogue.
If your battery has cap's you can remove to add water on top of the battery, it's going to be wet, that truck is not going to be gel, that for extreme off road.
All scooters (or at least 99% of scooters) will run on 24 volts, therefore there is usually two 12 volt batteries needed to run the scooter. Unless the scooter is very old, these will be in the form of dry batteries (sealed top with no water top up required) usually GEL, SLA or AGM. It Doesn't matter which type you use but GEL tend to last a bit longer and are more expensive. As to which size of battery you require, it should be marked on the battery somewhere in an Ah rating, for example 12v/31Ah. I would need to know which model of scooter you have to be able to help you with the size you require. You should also replace batteries in pairs, not as a single and should use the same rating and type, so dont put 31Ah batteries with 36Ah batteries and not an AGM with an SLA, GEL etc. Hope this helps...
The new battery is most likely a gel type - they are zero maintenance, non-vented batteries. They are also becoming much more common than the older lead-acid style.
Hope this helps,
Sherwin
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