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Keep your start-stop system running smoothly with this reliable AGM auxiliary battery—maintenance-free, spill-proof, and built for modern vehicle electronics.
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What Our Experts Are Saying
This battery is built tough. The Duracell Platinum AGM Auxiliary Car Battery Group 401 | 170CCA delivers reliable backup power for start-stop systems—an exact-fit replacement for select Chevrolet, Jeep, and Mercedes-Benz models.
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Get powerful 760 CCA starts and superior recharge performance—this AGM battery handles extreme temps and heavy electronics with long-lasting reliability.
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You’ll get reliable starts every time. Power your start-stop system with the Duracell Ultra Group 60B19RS auxiliary battery. A reliable direct-fit replacement for hybrid, electric, and gas vehicles needing consistent auxiliary power.
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Looking for hassle-free power? The Duracell Ultra Platinum AGM Auxiliary Car Battery Group 402 | 430CCA is a premium, leak-proof battery built for start-stop systems in hybrid, electric, and gas vehicles. Delivers reliable performance and long life.
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Need something reliable? Keep your start-stop vehicle running at peak performance with the Duracell Ultra Group 85B24LS auxiliary battery. A trusted, direct-fit replacement for hybrid, electric, and gas vehicles with advanced systems.
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Power - by Joe Weber - updated on 2/20/2026
Don't guess when replacing your battery! Our guide explains how to find your correct BCI Group Size, how to spot hidden auxiliary batteries, and why sticking to the right specs is critical for your warranty. Get the perfect fit today.