What size of Lipo fits in here?!?

[Seagal99]

Hi, has anybody got an MP5 with one of these CYMA hand guards attached? I want to know what size Lipo battery fits best in the rather small compartment? Looking at Turnigys. Mine has a retractable stock (which I want to keep) so the stock is out of the question. Thanks

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[EDcase]

Roughly measure the space and then use the dimensions in hobbyking

 

[Philby21]

I bought a couple of these from Component Shop, obviously HobbyKing will be a lot cheaper though.

It's still a bit fiddly getting them in but they do fit and work well.