BMW 335i Battery

The BMW 335i uses an H6 battery that is mounted in the passenger side of the trunk, for which OPTIMA offers a direct-fit upgrade with our DH6 YELLOWTOP. Many newer vehicles have moved batteries to the trunk area for a variety of reasons, including better weight distribution in the vehicle, more space under the hood and less potential damage from engine heat. However, these newer vehicles require some additional steps to be taken when replacing batteries.

Battery replacement in the BMW 335i is not an overly-challenging task, but you will need some basic hand tools to unfasten and re-tighten the connections. You will also need to make sure you attach the vent tube to the battery, as in the unlikely event that the battery is severely overcharged and vents fumes, those toxic and flammable fumes should be directed to the outside atmosphere. You may also need to "register" the battery with the vehicle's charging system, which can often be done with a scan tool. Dealerships obviously have that equipment, but so do a lot of independent repair shops, if you don't want to make that purchase yourself. 

If that sounds like too much of a hassle, you can always take your vehicle to a dealership for service, however, don't expect their pricing to be competitive with a do-it-yourself option. In fact, many consumers who need to register their batteries can buy the replacement battery and scan tool to register it for less than the cost of having the service performed at a dealership.

Some dealerships can also be ambiguous about what type of battery is being installed in your vehicle and what the warranty terms are on that battery. OPTIMA's DH6 YELLOWTOP is a high-performance, AGM battery that can last up to three times as long as a traditional flooded lead-acid battery and it comes with a three-year, free replacement warranty. Fully-charged, the OPTIMA DH6 YELLOWTOP will measure about 13.0-13.2 volts. 

Whether you choose an OPTIMA or some other brand of battery, proper voltage maintenance is the key to maximizing battery performance & lifespan. We are so confident this is the case, if you buy an OPTIMA battery from us and one of our Digital 1200 battery chargers & maintainers at the same time, we'll extend your free replacement warranty coverage by a full year!