BMW E46 M3 Battery Installation - Applies to 323, 325, 328 & 330 - YouTube
BMW E46 Battery Replacement and Connection Notes| BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Parts Technical Article
BMW E46 M3 Battery Replacement - chrisparente.com
How to methodically find the battery drain in our E46–and fit an Opt | BMW M3 | Project Car Updates | Grassroots Motorsports
BMW E46 Battery Replacement and Connection Notes| BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Parts Technical Article
E46 M3 OEM vs E46 M3 CSL/Mini vs F80 M3 Li-ion Battery - NA M3 Forums