A quick run down of fitting some different battery packs into the Losi Mini 8ight T (truggy). Music by The Chemical Brothers, "The Salmon Dance" instrumental.
Here are links to the batteries you see in this video:
2S lipo (the one that fits): http://www.amazon.com/Venom-2000mAh-Battery-Universal-System/dp/B002AK38TS/ref=sr_1_1?ie=UTF8&qid=1432014714&sr=8-1&keywords=venom+2s+lipo+2000mah
2S lipo (the one that DOES NOT fit): http://www.amazon.com/Duratrax-LiPo-Onyx-7-4V-4000mAh/dp/B007KMWR3E/ref=sr_1_3?ie=UTF8&qid=1432014750&sr=8-3&keywords=duratrax+2s+4000mah
3S lipo: http://www.amazon.com/Lectron-Pro-11-1-volt-Connector/dp/B00HJBYCHA/ref=sr_1_8?ie=UTF8&qid=1432009861&sr=8-8&keywords=3s+lipo+2700mah
Here are the plans for the battery tray insert that I printed: http://www.thingiverse.com/thing:44182