Originally Posted by Havene
Also if possible would rather not use a LiPo
Also, it is against the rules of this forum, to post links to airsoft guns outside of the 18+ section. I suggest you to replace the links by the name of the rifle. This may seem stupid and/or counter-intuitive, but that's the way it is.
Now, to answer your question. The battery usually goes in the buffer tube and/or in the stock. I "think" it's called a stick battery, because of the form it has. You need a battery will fit there. I'm not an expert on this field, but google seems to find good result with the terms "airsoft buffer tube battery" or "airsoft stock battery".