Doc:
The Li-ion pack slides into the batt. hatch hole. If I remember I had to take a shaving off the flange where the hatch sits on when closed. This is a 3 ah batt. and gives about ten mins. of run time. As you say it's a slippery plane and flies at half throttle most of the time. The li-ions can be fast charged and take about 40 to 45 mins to charge on the FMA Balance Pro. Safety factor over lipos is much higher. You don't need a fireproof box and all that paraphanalia to charge them with. These don't catch fire if you look at them sideways. Much cheaper than lipos too. They are a little heavier and physically slightly bigger but the benefits much outweigh the detriments. By the way, these are 10, 1500 MA cells in a 2 P configuration, so I make up 3 cell packs for the foamies.Was flying combat with Reno Racer 3 WEEKS ago. Had a midair and the batt. departed out into the boonies. Was found today. Charged it up and flew it. You wouldn't do that with a lipo.

Gord.