i like orion packs i started with an used one that was puffed and was keeping up w/ the fast guy at our track only reason i lose is because of cleanliness, but fast laps are usually close like within .2-.3 of a second which is more of my line which translates to being a few seconds off of his overall run. i just switched over to my used crc, which is kind of cracked around the terminal part but it isnt puffed. it's a 90c but i havent seen much of a drop off. but i will be buying new batteries here soon for 2s and 1s