E36 Battery Mount for Optima 35 RedTop and D35 YellowTop

Your standard lead acid battery can leak acid and form rust in your battery compartment. This silently happened to our E36 before we could even notice there was an issue. Even with an acid-neutralizing mat under our OEM battery, we still fell victim to battery acid ruining our battery compartment.  Optima solves this issue with absorbed glass mat (AGM) batteries that don't leak. There is a RedTop variant for general use, and a YellowTop that can withstand deep cycling. What deep cycling durability means is that Optima YellowTop batteries can be revived from low charge more times than a typical lead acid battery. Low charge will damage typical lead acid batteries and greatly shorten their lifespans. YellowTops are robust batteries that can bounce back after your battery loses charge, whether it's from a failed alternator or from leaving your headlights on accidentally. They are also great for cars that are parked for long periods of time without access to a battery maintainer. Recharge