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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500W Solar Panel 12V Polycrystalline Silicon Solar Charging Panel Kit Outdoor Household Portable Rechargeable Solar Cell Charger
Aliexpress UK
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.
eBay
4Pcs/set Cable Protector For Samsung 25W Charger Protection Cute Cartoon Protector Spring Cable Winder Accessories
Aliexpress UK
【Fit All types of Battery】 -- Fit for Lithium Battery, Lead-acid Battery, AGM Battery etc. 【Delay Setting Function】 —— The new delay function avoids frequent switching on and off of the isolator due to unstable current, which prolongs the isolator and battery life.
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Worx WX106 8V Rotary Tool USB Charger Handle Cordless Mini Engraving Grinding Polishing Variable Speed Power Tool set + ACC
Aliexpress UK
Built-in LED indication (lights up when VSR starts). 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.
eBay
1PCS Portable Battery Box USB 5V 1A Power Bank Case 18650 Suite Battery External DIY Charger Box Kit Universal Cell Phones
Aliexpress UK
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.
eBay
1/5/10Pcs Type-C USB 3.7V 4.2V 1A 5W Lithium Li-ion 18650 Battery Charger Board DC-DC Step Up Boost Module TP4056 DIY Kit Parts
Aliexpress UK
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Aliexpress UK
Built-in LED indication (lights up when VSR starts). 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.
eBay
18650 Power Bank Battery Charger Case 5V 1A Portable USB Power Bank Kit Storage DIY Box For Phone MP3 Electronic Charging
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.
eBay
200W Solar Panel Kit With 30-60A Controller DC 18V Portable Solar Power Charger for Bank Battery Camping Car Boat RV Solar Plate
Aliexpress UK