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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USB C to Split Wireless Charger For Samsung Galaxy Watch 6 5 4 3 7/Galaxy Active 2 Interface Fast Charging Dock Convenient Carry
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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
3IN1 Metal Streamer Cable Is Suitable for Apple Android Type C Mobile Phone One Split Three Fast Charging Luminous
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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
BMS 10S 36V 15A 18650 Li-Ion Battery Protection Plate Split Port/Same Port With Line And NTC Charging Protection Module
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
60W Type-C To USB C To Micro USB To Lighting Fast Charging Adapter Kit for IPhone 14 13 12 Pro OTG Converter Multi Storage Box
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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
VR Link Cable For Meta Quest 3 VR Headset Fast Charging USB3.0 Gen2 to Type-C 5Gbps Data Transfer for Quest 3S/Quest 2/Pico4/PS5
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Working principle: When the engine is turned off, the relay will isolate your leisure battery from the main starter battery. Therefore, it will not drain the battery of the main starter and you will always be able to start the vehicle.
eBay
Portable Multi-functional Data Cable Storage Box, 60W Fast Charging Mobile Phone Holder, Charging Cable Set, Multi Head Adapter
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. - Suitable for most 12V charging systems- Surge protection. When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery.
eBay
New 60W Fast Charging Mobile Phone Holder Multifunctional Portable Data Cable Storage Box Charging Cable Set for Traveling
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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
Hidden Super Fast Charging 60W USB C To Type C Cable For IPhone Android 5 In 1 Charging Case Set Adapter Cable For Xiaomi
Aliexpress UK