I use the FMA Scorpion Packs in my Brushless E-Maxx and I can't say enough good things about them. I've always been a lower voltage BL guy, 14 cells before and now these 7.4v packs x2 now. All I can say is they certainly perform better than my 14 cell packs (and I was using good packs!) plus the weight savings allows you to do things with your truck not previously possible. The LVC hookup is simple and safe. Best of all, they were totally drop-in and race. No mods needed. (I use an 18.97 & a 10L or 9L) killer speed, way more punch and peace of mind. My advice, get one pair and two chargers, this way you can race the same packs several times per day. I had plenty of time between heats to let the packs cool and then charge them to 90%. At bigger races I can slow charge them to 100% with plenty of time.