Here is a pic of the stand-alone charger stand that I made for my (2) cell ZipZap today. Once I had the parts, it took an hour to construct.
I used a multi-voltage 300 mah A/C adapter ,with multiple plugs, that I got from Target ($11.99), a Radio Shack 2"x3" project box ($1.99), a Radio Shack 1/8" phone jack #274-248 (2 for $1.99). Plus, a charging pad off one of my extra clone controllers.
I charge my (2) cell ZZ for 5 min, but if my calculations are correct I should be able to go 10 min on my (2) 50 mah batteries at 3v @ 300mah to completely charge my batteries.
Cheap and effective, with readily available components!
John