Hello guys!

New guy in forums and R/C world too, and as normal from a beginner I come with some questions, but first some background about the project.

As title say I got a M1A2 Abrams from Hobby Engine, I find it a fun an very cheap (price) tank and love it, but I find it to be a bit slow in general and I'm not a fan of plastic tracks, so I was getting the idea after watching a YouTube video, to upgrade my tank in a small way, but got no idea if it will work.

First get a new set of gearbox with metal gears, was thinking of this one:
Henglong 3869/3879/3888/3899

In said video, this guy used a Tiger I metal tracks and, but they will work? If yes, this would be good?
Mato Metal upgraded Tracks, sprockets, idler wheels parts set for Heng Long 3818-1

For turret traverse also noted it can go 360 degrees and painfully slow, this is solved with a new unit?

Also I leave link for the video that gave the idea to try this:
http://youtu.be/0YETidyolnY I know some guys will go for the "Buy a better tank" way, but here in Mexico city are a bit expensive and rare to find, a Tamiya 1/16 King Tiger is over 900dlls and you still need to buy a controller for it, sorry for the long post and thanks in advance!

Also I got another question, this time about batteries, I play airsoft and moved long ago from NIMH to LiPo batteries, so I got the idea to change the stock battery (7.2v 800mAh) to a 8.4v 1100mAh, but when I looked at both batteries something was wrong, stock one got the polarity inverted compared with the airsoft one, pics for reference (Left new battery, right stock one)



Extra voltage will damage something?

And when looking in tank's insides the question continued, black wire is really ground? If yes I only need to invert the tamiya connector in tank to use the new battery, right?