Bas, The charger I use was supplied by power flight and the lith-ions take about 2 hours for a full charge, they never get cycled, and will hold a full charge for weeks. Skyborn/Power Flight is in Texas, there # is 972 267 5099.
I've seen the GP Wagstaff Extra and it looks good, let us know how it flies.
Bananas, the G-62 is used often in the Laser 2000 and is a good combo. there were at least 3 with that engine at the Top of New Jersey Fly-in.
Keep smiling :^)