Yes, of course.
There are five classifications of airsoft, one is gas operated the second is battery operated, the bolt action gas operated uses a top level gas, spring, and co2. the only one you need batteries for are the battery operated.
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Most bb's will work in most guns. There are 2 different sizes (6mm and 8mm) but 8mm bb's are very hard to find, because there are only a hand full of guns that use them (I know of 1 gas blow back rifle and maybe 10 of revolvers that do). Where bb's vary the most is in weight. The standard is .2g, which can be used in almost all rifles and pistols. If you have one of the all plastic under 100 dollar guns you should probably use .12 g bb's because they will put less stress on your gearbox and give you higher fps (they are not very accurate though, which is why .2g bb's are more commonly used). For increased accuracy snipers and some rifle users will use heavier bb's (for rifles usually only up to about .25g, for snipers all the way up to even .4g with the most common being .25g and .3g). These heavier bb's will fly straighter for longer, which is ideal for snipers and high end AEG's that can handle the extra stress and have the power to shoot them at a decent fps (the heavier the bb the lower the fps).
By upgrade I'm guessing you mean longer battery life. You can purchase battery packs that will last longer, but you have to take into account the initial size, you dont want to buy a new battery just to find out it wont fit in your gun.
no there are a various amount of different battery packs for different quality internals of guns for a plastic gearbox use a 7.2 or 8.4 volt low mah battery. for metal gearbox use 8.4v high mah, 9.6v, 10.8v, lipos