I have a 2013 and swapped my battery out recently. No problems at all, if anything, a slight improvement in starting but that could be me. I left the battery out at least 15 minutes too, the old one was leaking and dripping down the sides so the tray and all needed cleaning out first.
2013 JKU Sport, billet, auto, 3.73, LSD, 315/75/16 Duratracs on MB 72, 10A springs, Bushwacker flatties
Sold - 2005 TJ, red, auto, 3.73, 33" Duratracs, 4" lift
Ice storm casualty in 2007 - 2003 TJ, green, auto, 3.73, 33" Duratracs, 4" lift