Stan,
Two years doesn't seem very long for the battery to last, unless Powabykes are known to have poor ones.
Has it been in regular use?
'Use it or lose it' seems to be the motto for batteries.
On the subject of use, there are a few members on here in the North East and we have a forum ride near Consett pencilled in for later this month.
I see you are in Hartlepool - monkey hangers also welcome.