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Sanyo 'large' battery, or custom battery that would fit in your gun. 8.4 volts, as much MAH as you can manage to get and fit in your gun's battery holder.
You can get a larger battery holder, or two batteries for now. Charger... find a decent computerized model with an LCD display screen. They are easy to use and pretty much foolproof. That should be around $100 US, give or take.
Internals; metal bushings, a spring of the power already suggested (but I'd avoid the M120). You're looking at about $30 total.
If you've never opened a mechbox, please read ALL the manuals and instructions that you can find before you try.
That's about it unless you have an upgrade expert handy.
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