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 until the damage is already done. 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 lifespan. YellowTops are robust batteries that can bounce back after your battery to 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 the YellowTop, and it's likely good to go again.
The only problem with Optima batteries is that they don't make a direct-fit battery for the E36, so their batteries can't be mounted using the factory battery mounting system. Our mounting tray allows Optima 35 RedTop and YellowTop D35 size batteries to be mounted in your E36.
We created a weight-optimized design, making it as light as possible and only as heavy as necessary. Using thoughtful part geometry, we were able to create a lightweight and cost-effective solution. We looked for weight saving anywhere we could, utilizing lightweight polypropylene strapping with a mini cam-lock to secure the battery over heavier metal tie-down hardware. Borrowing on our aerospace experience, we used sheet aluminum and aircraft rivet construction to minimize weight over a machined part. We even took the time to create a dimpled lightening hole in the mounting bracket. The result is an assembly that weighs a feathery 18 ounces (514 g).
Fits all E36 models.
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