Battery suggestions?
 

I'm currently running nanotech 4200 shorty packs in my b4.1. I've only had them and the buggy itself for about a month and I'm not super impressed with these batteries. I run nanotechs in my other kits as well with no complaints but with my buggy and its 17.5 motor, these batteries aren't doing so great. After a couple minutes of running, they really start to lose their punch. I was considering buying the thunder power 3800 shorty pack. Would there be a noticeable difference in performance?