A:AnswerThank you for bringing this to our attention. We'll work with Best Buy to have this information updated. We apologize for any inconvenience this may have caused.
A:AnswerYou can connect more than one but the length of time without AC will shorten so if you need to connect more than one get one with the highest rating you can afford.
A:AnswerI do not think this unit does any advanced power conditioning beyond a very simple (possibly) EMI filter. Even the surge protection is a VERY low level protection.
A:AnswerThis UPS provides 120v AC power for a period of time when the electric power goes out. Since your original backup was only 2 9v batteries I would say there is enough battery power to lower your chair at least once