You should not leave your mobility scooter on charge all the time as it's not really needed and can shorten the lifespan of the charger and sometimes the battery as well.
You only need to charge your mobility scooter overnight which is enough and then unplug it during the day and then plug it back in overnight.
Although mobility scooter battery chargers have a cut off to stop charging the battery when it's full there's always the chance of that malfunctioning and causing over charging and possibly fire.
So only charge it overnight which is enough to give you the needed range.
Mobility scooters can travel around 10 miles on average on a full charge although some mobility scooters can travel as far as 15 to 25 miles on a full charge.
That is for average size mobility scooters and for the cheaper mobility scooters as they usually have a 10 mile range.
Larger size and more expensive mobility scooters can usually travel as far as 15 miles to 25 miles on a full charge.
Also your weight and the batteries age can also affect the miles you can travel on the mobility scooter as well.
As the mobility scooters battery ages it can lose the range it can take the mobility scooter before it drains.
Also make sure you fully charge the mobility scooter to full charge before you take it too far or you could end up stranded.
My Grandpas mobility scooter can usually go 25 miles and then it needs charged.
He had a cheaper version and smaller mobility scooter that could only go 10 miles before it needed a charge.
He drives his mobility scooter all over town and has no issues as long as the battery is fully charged.
When your mobility scooters battery gets older it needs replaced or they lose their ability to keep a charge long enough to give you the mileage range it used too.
Most mobility scooter batteries need changed every 1 to 2 years although some mobility scooter batteries can last as long as 3 years depending on how often the mobility scooter is used.
Also if you're a veteran you can get a free mobility scooter from the VA and they will also repair anything that needs repaired on your mobility scooter such as the batteries, seat etc.
Or you can buy a mobility scooter out of pocket or sometimes some health insurance may pay for the mobility scooter if your doctor says you need one.