- Geraldton:
- (08) 9964 8404
- sales@batterymartwa.com.au
Dual battery solutions for 4WDs, touring vehicles, work vehicles, camping equipment and other 12V accessories.
A dual battery setup uses a second battery to power accessories while keeping the vehicle’s main starting battery protected. The starting battery remains dedicated to starting the engine, while the auxiliary battery supplies equipment such as fridges, lighting, communications devices, inverters and charging outlets. A suitable isolator or DC-to-DC charger manages charging between the vehicle and auxiliary battery.
Built to support a second battery for accessories while helping protect the vehicle’s starting battery.
Auxiliary power for extended trips, remote touring and off-grid travel.
Keep a compatible 12V fridge operating without relying directly on the vehicle's starting battery.
Power lighting in a campsite, vehicle canopy or work area.
Support communications equipment, tools, chargers and other work accessories.
Provide auxiliary power while travelling or camping away from mains electricity.
Combine a compatible auxiliary battery and charging system with solar input for longer off-grid operation.
Accessories operate from the auxiliary battery, helping keep the starting battery ready to start the vehicle.
Dependable power for fridges, lights, communications equipment and other compatible accessories.
A compatible DC-to-DC charger can recharge the auxiliary battery while the engine is running.
Selected charging systems can accept solar input for additional off-grid charging.
Systems may be installed under the bonnet, behind a seat, in a canopy or in a battery box.
Capacity and charging equipment can be selected for the vehicle, accessories and expected running time.
Every dual battery system should be matched to the vehicle’s charging system, available installation space and expected accessory load. Modern vehicles may require a DC-to-DC charger rather than a basic battery isolator, and battery chemistry must match the charging profile. Correct cable sizing, circuit protection, secure mounting and ventilation are important for safety and reliability.
AGM Deep Cycle Batteries: A sealed, maintenance-free option designed for repeated cycling.
Lithium Batteries: A lightweight option offering high usable capacity and long cycle life when paired with a compatible charging system.
A strong auxiliary battery option for 4WD touring, camping fridges, canopy lighting, communications equipment and other 12V accessories.
Part Number: AT12900DSP
Voltage: 12V
Capacity: 105Ah
CCA: 580 CCA
Dimensions: 307 × 167 × 215mm
Terminal Configuration: Automotive Post & Stud (DT)
Weight: Approx. 27kg
Ideal for larger dual battery systems, caravans, camper trailers, higher accessory loads and solar-supported touring or off-grid setups.
Part Number: AT121000DSP
Voltage: 12V
Capacity: 120Ah
CCA: 720 CCA
Dimensions: 328 × 172 × 220mm
Terminal Configuration: Automotive Post & Stud (DT)
Weight: Approx. 30kg
Tell us your vehicle details, what equipment you need to power and how long you expect it to operate. We will help determine the suitable battery capacity and charging requirements.
You don’t need to work it out yourself – that’s our job. Use the Find My Battery search above, or give us your registration or vehicle details, and we’ll match the right battery to your vehicle.
Yes. When you purchase a battery from us, we’ll fit it free of charge while you wait. We can also check your charging system and dispose of your old battery responsibly.
Yes. We offer jump-start assistance and on-site battery installation when you can’t get to us. Contact the team to confirm availability and arrange a visit.
Absolutely. We supply batteries for marine, mining, commercial and mobility applications, as well as cars, trucks, motorcycles, caravans, solar systems and other equipment.
Warranty coverage varies by battery brand and model. Our team will explain the applicable warranty when you purchase, and we provide practical warranty support if you experience a problem.
