Thinking about buying the portable Hoyer 340. Right now it will only be for emergencies , like falling on the floor or maybe I hurt my shoulder. Trying to decide if I should get the electric or manual. I would like to get the electric but it runs on lead acid batteries but worried they'll go bad while in storage. A new battery pack is @ $250.00. So a couple of questions,

Can you take apart the battery pack and just replace the batteries inside, would probably be a lot cheaper.

How long does a battery pack last if left always on the charger.

Will the lift work if the batteries are dead but you have the unit plugged in to the wall outlet?

Or would it just be better to get a manual lift for my purposes. I've never used a lift so I have have no idea how difficult a manual lift would be.

btw - I thinking about the portable because I want to fold it up and keep it out of the way. I don't have a lot of extra space in my condo.