VFC SCAR L should take a "mini" battery if I remember correctly... There's SEVERAL LiPO batteries that'll fit and work just fine.
For an airsoft gun I'd suggest a 7.4V 20C, It'll give you the rate of fire of a 9.6V NIMH Battery.
Gun Technician and Tuner
Well versed in every AEG version and all major gas and spring systems.