8.4v 1400mah/1600mah "mini" battery packs...as said, in 2/3A cell size. They work great. A 9.6v mini pack will probably not fit tight handguard spaces.
I personally do not like the mini 9.6v 2200mah butterfly packs...can't recall what the cell size is...sort of between a AA and AAA. Numbers aren't everything.
PEQ boxes/battery bags are options...but a lot of guys don't like the extra stuff/wires hanging off their guns.
LiPo batteries are super compact and pack a lot of punch. Care must be taken in using them properly...and understanding that is probably the biggest hurdle for most.
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