We have two mobility scooters. The best of the two is a Pride Celebrity X.
The batteries last more than 5 years if they are properly charged. Both are 3 wheel models which are stable on rough ground but can tip if you turn to quickly or a rear wheel catches a curb/rock. The 4 wheel models are much more stable but heavier.
Both scooters break down into 6 pieces. The heaviest parts are the 2 batteries and rear wheels with drive motor. The seats are cumbersome to load and unload.
Ours are rated to go 6 miles on a full charge. We primarily use them to run around the campgrounds and at events like a car show or flea market. I've never measured the distance we have traveled on a single charge but so far we have not had them run out of juice.
The second scooter is by Invacare. It's not quite as nice as the Pride celebrity but works just as well. Both of ours are about 10 years old and still going strong.