The more powerful the batter just means the longer your gun will last before it has to be recharged. 'Fox Airsoft Store' offers some gun upgrades, these will improve your gun. Also, a gun's fps is already pre-determined by what parts are installed, upgrades will improve the gun but stronger batteries will only extend the gun's life before it needs to be charged.
Yes it does.
No, The battery size determines the Rate of Fire or how fast it shoots. The fps is determined by the spring.
Add a battery
Probably in the stock.
It tack a wholesome big piece of the pie, if you know what I mean? A airsoft battery tacks itself all the time.
By it off of airsoft megastore
No, it was not designed for it, running a larger battery will increase wear on parts very quickly.
No
Solder the wire.
Yes
get a better battery for example if you have a 7.2v battery get a 9.6v battery and it will shoot ALOT faster
Yes. Many companies make powerful batteries. Li-Po gives your gun the fastest rate of fire and is a lot smaller. If you are going to have a more powerful battery, you should see if you need to upgrade the motor and or put some metal gears so they don't strip out as fast as plastic.
It depends on which company makes it, and what battery it uses.