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Once you've figured out what type of battery you should get – gel cell or wet cell – you need to figure out the battery power you need. Battery power is rated in amp hours and comes in three sizes. If you want a more powerful battery, you'll get one with a higher number of amp hours. Wet cell batteries tend to have amp hour ratings ten percent higher than that of gel cell batteries.
The three sizes of battery power are group 22, 24, and 27. A group 22 battery is the standard size. A group 24 battery is suited for heavier high performance chairs. The most power goes to the group 27 battery which you might use for extended travel distances and frequent use over sloped terrain.