Hey guys i have a d-boys m4 s-system and it came with a 8.4 and i brought a extra, but was wondering if i am able to upgrade to a 9.6 without harming the gun, there is plenty of space to put the battery so that's not a worry, Also im not quite sure of the advantages of having a bigger battery, apart from lasting longer, if there is any other advantages/disadvantages could you please shed some light, thanks very much and sorry for my noobie-ness.