US 110V - Left your charger at your ex-wife's house?
Or maybe you want to have a second one at the office.
Either are plausible. Here's the original D-Power charger with mains lead and mains plug, for US 110v
AC110v (Not suitable for UK and EU use)
OUTPUT: 54.6v - 3.0a
Also compatible with those others bikes that look like ours ;-)