Crane battery into VLTOR stock?

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Alright there guys?

 

I recently bought a Specna Arms SA-V01 (similar to a G&P Sentry), but I've been having some trouble getting the battery into the stock.

 

It's rear-wired, and the stock is basically a VLTOR Modstock. I assumed the process would be the seem as getting the battery into a SOPMOD stock, but annoyingly it's not the case. If anyone could give any insight on how to do it, it'd be great.

 

Again, the rifle's rear-wired, with a 6-position replica of a VLTOR Modstock. I'm using 8.4v and 9.6v NiMH batteries, crane type ones.

 

Cheers guys.