Before you buy a battery replacement for your mobility scooter make sure to know which one you need. Apart from the power and voltage it is important what type of battery you need. All the batteries usually need replacing every 12-18 months depending on your usage. You can charge them from standard socket via the battery charger. It is advised to never run them all the way down and do not leave dead battery without charging for longer than a day.
You will find 3 different types of batteries for mobility scooters: Lead Acid batteries, Gel Cell batteries and AGM batteries. Check your mobility scooter technical documentation for what type you need.