Congrats on the new bike, and new hobby, dirtbiking is a lot of fun! Unfortunately
, if you never own a petrol/gas bike, you'll miss out on having to clean and oil an air filter every ride, and do an engine oil change every 6-10 hrs of riding! Oh, and you'll also not have to select the correct gear while riding, nor have to pull in the clutch to prevent stalling!
Unfortunately, I still have to wait a couple of months for my FX. Regarding single battery placement, in all the photo's I've seen, the owners have it located in the rear. I've never ridden a Zero, but in theory, rear compartment should be better for having a more central pivot point for the bike to change angle, because the weight of the rider, battery and motor are more central. Apparently, that's part of the reasoning behind Honda putting twin mufflers on their dirtbikes, and Yamaha's new engine design(having rotating mass further back towards centre of bike) on the YZ450F. Having said that, having no battery in the front will keep the front end lighter for lofting more easily over bumps, but having a battery in the front will put more weight on the front tyre for grip(putting the right amount of weight on the front tyre is the key for grip, which is also adjusted by the rider's body position, and also the amount of braking force applied).
Probably the best single bit of advice I can give to a learner is to try to keep your upper body perpendicular(at 90 degrees) to the ground when cornering(on dirt). e.g. if it's a flat corner, lean the bike over but keep your upper body vertical, to put weight on the tyres for grip, and if the corner is banked(a berm), you can lean with the bike, so that you and the bike are perpendicular to the angle of the berm, because the berm prevents the bike from drifting outwards and puts more force on the tyres for grip, unlike a flat corner. Watch some video of pro riders(motocross or enduro) to see how they do it.