My dad is 92 years old. He has had his chair almost a year. He has had to replace the batteries three times in a year and the charger twice. They don't tell you that the batteries need to be replaced multiple times a year. In fact, they told us he could use his chair up to twelve miles a day! His trips to the bathroom, kitchen, and back to the bedroom are probably not even a quarter of a mile, but apparently even that wore the batteries out. The first time, his batteries were under warranty but the second time they would not replace because they had replaced them once. Now we are needing a new charger and our warranty will be out in 5 days, but they are refusing to replace it until we 'prove' that it is not the batteries by buying and installing new batteries. Service suggested that I take the chair down to an automotive shop and get the batteries tested. How is a 92 year old and his 90 pound daughter going to get that chair into the car to be tested by an automotive shop? And the batteries will take a few weeks to arrive, at a cost between $200 and $300 including shipping. The service techs on the phone have been rude and unhelpful. Overall, it is disappointing.