Airsoft Battery Pack with 7.4v are usually LiPo battery pack, consist of 2 cell of 3.7v LiPo battery. Small profile battery which is very light in weight and size. Would fit on varities of AK47, MP5, G36, M4 and more; if your battery compartment can fit 8,4v, it would fit the 7.4v LiPo battery pack. The advantage of 7.4v LiPo is small in size, but outputting equivalent or more power of 8.4v battery, with higher cranking amp, up to 20c. Great alternative to those Airsoft Electric Guns which cannot handle 11.v and would still like the LiPo Power.