it depends on the brand. i myself have a airsoft gi g&g m4, and could easily run an 11.1v lipo in it. check our the brand and maybe look up some reviews. but without the brand i cannot help you much more. but for most guns, i would not recommend it. just to be safe.
Large battery lasts longer and maybe has better rate of fire. Don't use too powerful batteries.
No it does not. The fps is controlled solely by the spring. Batteries are mainly small types and small types are either 8.4v or 9.4v the difference is the higher the voltage the better the fire rate.
Depends on the battery. It varies greatly from a small battery to a large vehicle battery.
A large matrix with small pixel will give a better resolution.
It needs a small connector and comes with a 8.4v 1400 mAh battery.
If there's varying sizes of airsoft pellets, then each size will only work for airsoft guns intended to take that size pellet. Others will be either too small or too large, and could end up damaging your airsoft gun, or even getting stuck in the barrel.
small
Small bacause if you have large you could hear things you are not supposed to
small pixels
better to jump a small battery with a big one. The other way (trying to jump BIG battery with a small one) may result in smaller battery being too weak to do the job or damage to the small battery. The scenario as you have described it is OK.
they are better and reproduces faster
The large collapse in the magnect field.
the large collapse in the magnetic field