When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery. So it does not drain your main starter battery and you will always be able to start your vehicle.
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new LiFePO4 48V 200Ah Battery Pack 10kwh Built-in 16S 200A BMS RS485 CAN Cell Pack For Solar System Home Energy Storage Van
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Advanced AGM LP120 Leisure Battery 120ah 12v. The Advanced AGM LP120 leisure battery is a low profile height 120ah dual purpose battery type. This battery can used for deep cycle use and for starting applications such as Motor Movers, Outboard Motors etc.
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3.2V 320Ah New 8000 Cycles Grade A Lifepo4 Battery Rechargeable Batteries DIY 12V 24V 48V RV EV Boat Yacht Vans Cells tax free
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ABS LP130 Leisure Battery 130AH. ABS 12 Volt Low Profile LP130 Amp Leisure Battery - 'Low Height-Profile 130ah sealed'. Capacity (C100) 130Ah. These compact batteries are designed for deep cycle battery applications where ordinary leisure batteries do not quite fit.
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8000 Cycles Grade A 3.2V 320Ah Lifepo4 Battery Rechargeable Batteries DIY 12V 24V 48V RV EV Boat Yacht Vans Cells tax free
Aliexpress UK
Advanced AGM LP120 Leisure Battery 120ah 12v. The Advanced AGM LP120 leisure battery is a low profile height 120ah dual purpose battery type. This battery can used for deep cycle use and for starting applications such as Motor Movers, Outboard Motors etc.
eBay
46B24L/R 12V 20Ah Car LiFePo4 Battery 12V Lithium Automotive Battery 720CCA with 100A BMS Replacement for Car SUV Bus Truck Van
Aliexpress UK
Dual Battery Isolators also feature surge protection and a L.E.D indicator designed to alert the user when the unit is engaged. When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery.
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24V 200Ah LiFePO4 Lithium Battery, Built-in 200A BMS, Rechargeable Battery, for RV/Camper, Solar, Marine, Overland/Van, Off-Gr
Aliexpress UK
Suitable for most 12V charging systems- Surge protection. Dual Battery Isolators also feature surge protection and a L.E.D indicator designed to alert the user when the unit is engaged. When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery.
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200W 100W Mono Flexible Solar Panel 20A/10A Solar Controller Module for Car RV Boat Home Roof Vans Camping 12V 24V Solar Battery
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Advanced AGM LP120 Leisure Battery 120ah 12v. The Advanced AGM LP120 leisure battery is a low profile height 120ah dual purpose battery type. AGM Leisure batteries can be drained using 70% of their capacity.
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Advanced AGM LP120 Leisure Battery 120ah 12v. The Advanced AGM LP120 leisure battery is a low profile height 120ah dual purpose battery type. Ampere Hours - 120Ah. AGM Leisure batteries can be drained using 70% of their capacity.
eBay