Dual Purpose

Dual Purpose Starting and Deep Cycle Batteries

A dual purpose battery combines high cranking current for engine starting with usable deep cycle capacity for running accessories. It suits boats, 4WDs, trucks and motorhomes where there is limited space for separate start and house batteries, or where one battery must handle both jobs reliably. This range covers 12V lithium and AGM options from 50Ah to 100Ah, with cold cranking ratings from 750CCA to 1400CCA.

Lithium Dual Purpose Batteries

The Invicta Hybrid lithium range spans 50Ah to 100Ah, with cold cranking ratings from 800CCA to 1400CCA. Models come in common automotive and marine case sizes, including LN2, LN3, 80DL, 95D, 95DL and H31H. This makes it easier to upgrade an existing starting battery without modifying the battery tray. For larger engines and high-demand starting, the Hybrid Max Extreme and Hybrid Max L Extreme deliver 1400CCA from an 80Ah package.

Lithium is lighter than lead-acid for comparable usable capacity and holds its voltage more consistently under load, which benefits both cranking and accessory performance. For dedicated house or auxiliary storage, see the wider lithium battery range.

AGM Dual Purpose Batteries

The Century Dual Force+ 12V 90Ah AGM provides 750CCA alongside deep cycle capacity in a sealed, spill-proof and maintenance-free design. AGM remains a practical choice where the vehicle or vessel charging system is set up for lead-acid charge profiles, or where a lower upfront cost is the priority. More sealed options are available in the AGM deep cycle battery collection.

Common Applications

• Marine: starting outboard and inboard engines while powering sounders, navigation lights and bilge pumps
• 4WD and touring: reliable engine starting with reserve capacity for fridges, lighting and accessories
• Trucks and commercial vehicles: strong cranking performance for larger engines with support for cab electronics
• Motorhomes and RVs: chassis starting combined with light auxiliary loads

How to Choose a Dual Purpose Battery

Cranking requirement: Match or exceed the CCA rating your engine manufacturer specifies. Higher CCA models such as the 1200CCA and 1400CCA Invicta Hybrids suit larger diesel and marine engines.

Accessory capacity: Estimate the amp hours your accessories draw between charges. Then choose a capacity that leaves enough reserve to start the engine reliably.

Case size and terminals: Confirm the physical dimensions and terminal orientation of your current battery. Variants such as 95D and 95DL share a case size but differ in terminal layout.

Chemistry and charging: Lithium offers weight savings and consistent voltage, but your alternator and chargers must support a suitable charge profile. AGM suits standard lead-acid charging. Our guide to lithium vs lead-acid batteries compares lifespan, weight and charging needs in detail.

Replace an underperforming starting battery and add accessory capacity in one step. Compare the CCA, capacity and case size of each model above to find the right dual purpose battery for your boat, 4WD or truck, and order today.