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On my ATM50 I have 5500km on it.
I could have gotten away with riding it stock like that, as I only checked up on some things.

Though the electrical circuit is now toast (probably a faulty wire, or a ground short), the valves have never been adjusted, but when cold it does make a ticking sound, not heard when the engine is hot.

The battery should say how much cca it has.
For reference,
a 4A Li battery has ~120CCA.
a 7A Li battery has ~150CCA.
a 10A battery has ~ <300CCA.

That being said, anything that looks round about the same as the connector plugs, or stock wiring (not flimsier), will do.

On those speedo's 80kmh equals 40MPH GPS verified.

At those speeds you got to be careful of floating valves. I've had it happen, not good!
You should be doing around 58-60MPH at that speed.
I'd not recommend to take the scoot past 55MPH, unless if your variator or gears lower engine RPM a bit compared to stock.
You probably have a 63cc kit on it.
At 55-58MPH your engine would be doing ~9+k RPM.

Depending on what you're looking for, a 75cc BBK will get you normal acceleration all the way to ~40MPH, instead of to 25MPH on a 63cc (and then from 25-35MPH creep slowly faster).

If you combine the 75cc BBK with a gear change you could possibly destroy your speedo, as the needle could get to that 60MPH point (horizontal) quite often.

You could always go with any of the red lego bricks here:
www.amazon.com/s/ref=sr_nr_i_2?rh=k%3Ali+battery+4+cell+12v%2Ci%3Aautomotive&keywords=li+battery+4+cell+12v&ie=UTF8&qid=1383805880

They seem to work fine!
The 4 cell might be on the small side for a scooter, but the 8 cell and up work wonders on any sub 150cc.

Also, cells are 3,3V, meaning 4 cell battery loads 13,2V. Since they're fast charging, voltage drops lower than with Lead Acid.

BMS on battery chops voltage charge, meaning if the charge voltage is too high, it'll only send small fractions of the charging wave to the battery for slow charging, and blocks current the rest of the wave. Scoot will be running the same as if the battery was disconnected, which would be the same as if the scoot was running normal.

I've had a few 200 mile trips on my 50cc, and a few 250+mile trips on my 127cc and 150cc, and those do seem to do hard on my shoulders.
A 200 mile trip on a 50cc is much more than a 350mile trip on a 250, first because it's a much harder, much more uncomfy ride, and second because the avg speed is ~35MPH on a 50cc, while the avg speed on a 250 is almost twice as high; meaning you'd do the same trip in half the time.

I've done several 200+ mile trips on my 127 and 150cc scooters, and they're a very nice ride!
On my BMS260, I did few 200 mile trips, but they're done in a few hours.

On small turbo's there is no real big lag. On larger turbo's a lot of the lag has to do with the fact that the engine makes lowest torque at lowest RPM. At those low RPMs, the turbo causes drag by kinda blocking the exhaust somewhat, while not giving enough air on the intake.
This is compensated by an exhaust and intake bypass.
An exhaust bypass that allows low amounts of air to bypass the turbo, without the turbo spooling up, causing very little drag from the turbo at low RPM. At higher RPM, the amount of air is too much to go through the bypass, and the turbo gets spooled up.
At the intake, there's also a bypass, with a valve.
That way you can have performance and efficiency of almost that of the NA engine without turbo, at lower RPMS; while still having the power of a turbo at higher RPMs.

Chances are that LiFePo4 batteries will increase, not drop in cost, as the prices of Li are currently skyrocketing (due to demand from all kinds of sectors, ranging from cellphones, tablets, wrist watches, to larger applications like electric scooters, cars and golf carts).