I'm staying away from R1 Wurks, and Exalt batteries, I've had both of them puff on me, unlike the cheap ZEEE batteries from Amazon. I'm currently using SMC's LCG, shorty batteries in stock 21.5 touring and 21.5 2wd. It's to early to tell if they'll puff, but at $40 a pack, vs $100, they're a win.