(SLA) Sealed Lead Acid Batteries
As the name suggests, the sealed lead acid batteries are completely closed units that are maintenance free as far as adding distilled water to the energy cells is concerned. Being sealed means no electrolyte can boil and escape from the containers. Most of the electric scooters today use SLA connections.
(AGM) Absorbed Glass Mat Batteries
The technology of this kind of https://www.scootmobielbelang.nl batteries was initially developed for military aircrafts. The AGM options have electrolyte stuffed with glass mat like substance providing it stability and spill proof property. The added advantage comes in form of the fact that these batteries do not run down of voltage in extreme cold conditions. These can be regarded as a good choice for mobility scooter batteries with relatively less charging time, however, there is a shortcoming that there is a risk of battery damage in case of overcharging.
Gel batteries come up with more added advantages with a stable gel like electrolyte that functions even when turned upside down. Gel, in general can endure higher number of charging cycles than SLA outputs. They are also quite safe for indoor equipments like electric power chairs.
U1 Batteries and Ampere Hour Ratings
As per convention U1 refers to a universal size of batteries with length of 7.71 inches, breadth of 5.16 inches and height of 7.23 inches. Ampere hour is the amount of charge a battery is able to supply once it is fully charged. Ampere hour also refers to the length of time the battery can supply current once it is charged completely. You can find different AH ratings on different batteries and more AH means longer backup time.