i got a 7.4v double stick lipo, it fitted my echo1 ak like perfectly..the battery was only like 10 bucks...(well to be fair i ordered a load off stuff so shipping was okay)
also weird that I had a NiMh stick type that fitted the gun just fine too...maybe your battery compartment is somehow smaller? I figure that even the shorter AK74U has the same receiver as an AK...
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