What Are the Best Lightweight Battery Options for a Porsche Boxster 986?

Outfitting your Porsche Boxster 986 with an appropriate, weight-optimized battery is crucial. Porsche, and especially the 986 models, are known for their unmatched power, performance, and a well-deserved reputation for speed. Therefore, selecting a suitable battery that can efficiently support the engine, the suspension, and the electrical parts of the sports car is paramount. This article explores the best lightweight battery options for a Porsche Boxster 986, focusing on two superior technologies – Absorbent Glass Mat (AGM) and Lithium-Ion (Li-Ion).

Absorbent Glass Mat (AGM) Batteries

AGM batteries, first developed in the mid-1980s, are a type of lead-acid battery. They offer superior performance compared to standard lead-acid batteries due to their unique construction. A fibreglass mat sandwiched between the battery’s plates absorbs the sulfuric acid, making the battery spill-proof. This design feature also enables the battery to deliver high currents on demand and offer a long service life, making them perfect for high-performance cars like the Porsche Boxster 986.

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An AGM battery’s weight comes in around 30-50 lbs, depending on the model. While these batteries are heavier than their lithium-ion counterparts, they’re still a solid choice for the Porsche Boxster 986 due to their reliability, lifespan, and power output. One of the best AGM batteries for your Boxster 986 is the Optima Batteries 8020-164 35 RedTop Starting Battery. With a weight of 31.7 lbs, it’s lighter than many other AGM batteries and provides high power cranking ability, allowing your Porsche to start reliably even in bad weather.

Lithium-Ion (Li-ion) Batteries

If you’re looking for a battery that offers even less weight, consider lithium-ion batteries. While these batteries are a recent addition to the automotive world, they’ve quickly gained popularity. The most significant advantage is their weight – lithium-ion batteries can weigh as little as one-third the weight of an equivalent AGM battery.

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The Antigravity Batteries AG-801 Lithium-Ion Powersports Battery, for instance, weighs a mere 1.56 lbs. It can provide enough power to start your Boxster 986, and it’s significantly lighter than any AGM battery. The downside, however, is its price. Lithium-ion batteries can cost significantly more than their AGM counterparts, but for those who prioritize weight reduction, the extra cost might be worth it.

Choosing between AGM and Lithium-Ion Batteries

Choosing between AGM and lithium-ion batteries for your Porsche Boxster 986 depends on various factors such as your budget, weight reduction goals, and the car’s intended use. For everyday driving, an AGM battery will likely serve you well. They are less expensive than lithium-ion batteries and can provide reliable power for your Porsche’s engine and electrical parts.

On the other hand, if you often take your Boxster 986 to the track, you might want to consider a lithium-ion battery. These batteries can significantly reduce your Porsche’s weight, improving its performance and handling. However, be prepared to pay a premium for this weight reduction.

Your Car’s Suspension and Battery Weight

Remember that your Porsche Boxster 986’s suspension is designed to handle a certain weight. If you significantly reduce the weight by switching to a lithium-ion battery, you might need to adjust the car’s suspension settings. Consult with a Porsche technician before making any significant changes to your car’s weight, and always remember to secure your battery properly. A loose battery can be a safety hazard, especially in a high-performance car like the Porsche Boxster 986.

As you can see, there are various options when selecting a battery for your Porsche Boxster 986, each with its advantages and disadvantages. Research thoroughly, consult with professionals if needed, and choose the battery that best suits your needs and budget.

The Impact of Battery Weight on Fuel Consumption

The weight of your Porsche Boxster 986 battery can indirectly affect your fuel consumption. Heavier batteries like AGM batteries can increase the overall weight of your vehicle, leading to more fuel being used. However, the difference is usually minimal and might not have a significant impact on your fuel costs.

Still, if you’re a frequent driver or if you’re particularly conscious about fuel efficiency, a lightweight battery like a lithium-ion battery can help reduce fuel consumption, albeit slightly. Moreover, a lightweight battery can lead to improved handling, especially if you use your Boxster 986 on the track.

The lithium-ion Antigravity Batteries AG-801, for instance, can shave off a significant amount of weight compared to an AGM battery like the Optima RedTop. Despite the higher upfront cost, this weight reduction can translate to fuel savings in the long run.

However, remember that weight reduction should not compromise the overall balance and stability of your Porsche. The Boxster 986 comes with a finely tuned suspension and exhaust system that are designed to handle a certain weight. A significant reduction in weight might require adjustments to these systems, especially the rear axle, to maintain optimal performance and safety.

The Importance of Cold Cranking Amps (CCA) in Selection

When choosing a battery for your Porsche Boxster, the cold cranking amps (CCA) rating is another factor to consider. CCA is the measure of a battery’s ability to start a vehicle at zero degrees Fahrenheit. In simple terms, the higher the CCA, the better the battery’s starting power in cold weather.

AGM batteries typically have a higher CCA rating than lithium-ion batteries. For example, the Optima RedTop Starting Battery boasts 720 cold cranking amps, ensuring reliable starts even in colder climates. On the other hand, the Antigravity Batteries AG-801 Lithium-Ion Powersports Battery has a CCA of 240. However, this lower rating does not necessarily mean poor performance, as lithium-ion batteries tend to offer superior cranking power for their size and weight.

Therefore, if you live in a colder climate or if you are a registered user on tracks that often see low temperatures, an AGM battery like the Optima RedTop might be a more suitable choice. Alternatively, if your Boxster lives in a warmer climate and weight is a significant concern, a lithium-ion battery might be worth the investment.


Choosing the best lightweight battery for your Porsche Boxster 986 involves considering factors such as your vehicle’s weight, fuel consumption, cold cranking amps, and of course, your budget. AGM batteries like the Optima RedTop offer a balance of weight, power, and affordability. In contrast, lithium-ion batteries like the Antigravity AG-801 offer significant weight reduction at a premium price.

Remember that any changes to your Boxster’s weight may require adjustments to its suspension and exhaust system. Always consult with a qualified Porsche technician before making significant changes and ensure that your battery is securely fastened to prevent safety hazards.

Ultimately, the best battery for your Porsche Boxster 986 is one that meets your specific needs and priorities. Whether it’s an AGM or lithium-ion battery, make sure to choose a reliable brand with positive reviews from other Porsche owners. After all, your Boxster 986 deserves nothing but the best.