The batteries in your mobility scooter or electric power chair are either gel or AGM (absorbed glass matt). Lithium batteries are rare but sometimes found in the latest travel scooter models.
Each battery has a life span which amounts to a certain number of full cycle charges, this can depend on the quality/brand of the battery. Gel batteries have almost double the life span of AGM batteries.
A well cared for and regular charged decent battery should last at least 2-3 years. Over time, the travel period the batteries allow will slowly decrease. If you are finding that your batteries run flat after just a short distance of travel, then it’s probably time to have them tested and most likely replaced with new ones.