Larry,
I thought the E throttles were using nominally "Futaba"like wire ordering. I think Airtronics was/is different. Basically you have ground (black or brown, +V(red or orange), and signal (white) on the plug. Now the plug itself isn't polarized (it is called "universal" now, which means you can plug it in with 50% chance of being correct!)

With respect to the balancing plug on the battery, there is a lot of controversy about them being non-standard. I have a combo of FMA mainly, the Brodak 4000mAHr battery, two ThunderpowerLite 730mAHr packs with no balancing plug at all, and a 2100mAHr pack from Hobby People I bought for a RC Ducted Fan Foamy--which tends to puff whenever I use it in the Foamy. All have different balancing plugs.

I have two chargers, the first was the Astroflite 109 (non-balancing) which charges through the supply plug (Deans), and on that charger I use an AstroFlight "Blinky" balancer. I have several adapters I use to interface the Blinky with the different packs. Then I bought the FMA cellpro 4s and that charges through the balancing plug. On it I have used only with my FMA packs which of course are the same style. It is another reason to stick with the same manufacturer/packager (of course the reason the manufacturer does it!).

 

Larry,
Almost all the "modern" third party RC stuff (like Hitec or others) have abandoned the key and leave it up to you to figure it out. It does get tricky!