Those batteries are great but honestly, If you want consistent batteries that stay the same the whole run, spend the money and buy a top of the line battery, especially if youre running stock. I have ran some cheaper batteries with high C ratings($45-$60 range) and they are great at first, amazing power but they fade off quickly and it only gets worse the older they get. Then I bought a Thunder Power 65C 3800mah shorty ($80 I think, not super top end battery) and the difference was incredibly noticeable. It lacked a little punch but the battery had the same exact power until it cut out due to voltage. It was great for the 17.5 motor I was running at the time, could clear the triple every lap whereas I was casing it towards the end of the heat with the cheaper batteries, which was important. Just my $0.02.