What vehicles use an auxiliary battery like this?

Many modern vehicles with start-stop systems, advanced electronics, or dual-battery configurations use an auxiliary battery. Common applications include newer Mercedes-Benz, BMW, Audi, and other European vehicles. Check your owner's manual for the correct group size and specification.

Can I mount this battery on its side?

Yes. AGM construction means the electrolyte is absorbed into glass mats, so the battery is sealed and leak-proof in any mounting orientation.

Is this a replacement for my main starting battery?

No. The AUX12 is an auxiliary battery designed to power electronics and support start-stop functions. It is not intended as a primary starting battery. Your vehicle's main battery handles engine cranking.

Deka AUX12 Auxiliary AGM Battery | 180 CCA

Name: Deka AUX12 Automotive AGM Auxiliary Battery (180 CCA)
Brand: DEKA
SKU: EASAUX12
Price: 128.95 USD
Availability: InStock

Deka AUX12 Automotive AGM Auxiliary Battery (180 CCA)

$128.95

Usually ships the next business day

12V AGM auxiliary battery with 180 CCA and 10 Ah capacity. Group 401 size, built for start-stop vehicles and auxiliary electronics.

Key Features

12V AGM auxiliary battery with 180 CCA and 10 Ah capacity.
Group 401 size measures 5.875 x 3.4375 x 5.125 inches for compact installations.
Sealed, maintenance-free construction with no risk of leaks at any angle.
Individual cell venting with valve regulation for safe operation.
Left positive polarity with top post terminals.
Made in the USA with a 12-month free replacement warranty.

Secure CheckoutFast Shipping631-982-0042

Product Details

Modern vehicles with start-stop systems, lane-keeping assist, and advanced infotainment setups often rely on a secondary battery to keep electronics running smoothly while the primary battery handles engine starts. The Deka AUX12 is that secondary battery, built specifically for auxiliary duty in vehicles that need steady voltage for their electronic systems.

At 180 cold cranking amps and 10 amp-hours of capacity, the AUX12 fits the Group 401 footprint, measuring 5.875 by 3.4375 by 5.125 inches. That compact size works in tight installation spots like the trunk, under a seat, or in a secondary battery tray. AGM construction makes it sealed, maintenance-free, and leak-proof regardless of mounting position. The design includes individual cell venting for safety and valve regulation to manage internal pressure.

Deka manufactures this battery in the USA and backs it with a 12-month free replacement warranty. For vehicles that originally came with an auxiliary battery from the factory, the AUX12 is a direct replacement that matches the OEM group size and terminal configuration. Left positive polarity with top post terminals.