I have a 2015 Pride Quest , bought second hand at 18 months old, in case of emergency & holidays , and it came with a sealed Lithium battery pack .
It has been unused, folded up in the garden shed for over 3 years , and last week I was putting the garden chair covers away, and had to move it.
So I put the key in and rode it out – still enough charge in it for 3-4 minutes use, after all that time.
Charged the battery for 4 hours or so, and it now shows it to be full – haven’t tried it since, and although I am confident it will be ok, I am now checking every week & charging if necessary, because ‘ have you seen the price of them ‘?