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
13 in 1 USB C Charging Port Universal Mini Cleaning Brush Metal Dust Plug Removal Cleaner Kit for iPhone Xiaomi Earphone Clean
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
Toocki PD60W USB C To Type C Cable For iPhone 15 Pro Max 5 in 1 Cable Charging Case Set USB Adapter Cable For Samsung S23 Xiaomi
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
Charger protector cable organiser for iPhone 15 14 11 13 18W 20W charging protection cover data cable management cord winder kit
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.
eBay
Mobile Phone Charging Port Dust Plug with Cleaning Brush Kit for IPhone 14 13 12 11 Pro Max AirPods iPad for Lightning Port Dust
Aliexpress UK
1 x 5mtr 110amp 16mm2 Red Cable. 1 x 1mtr 110amp 16mm2 Black earth Cable. Screws to fix fuse boxes & cable tie bases. 2 X Fuse Holders & 100amp Fuses including a spares. 2mtr Split conduit to protect cables in Engine bay.
eBay
Charger Protector Cable Organizer For iPhone 15 14 11 13 18W 20W Charging Protection Cover Data Cable Management Cord Winder Kit
Aliexpress UK
Simply connect the relay between your starter battery and leisure battery and the relay takes care of everything, making sure your starter battery is not drained for when you need to get going again.
eBay
2025 NEW AA Smart Charger 4/8 Slots with 1.5V 4255mWh Lithium Batteries – Fast Charging Battery Charger Set
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 18650 soldering-free battery box DIY mobile power set material Charging box Suitable for home, go out and other occasions
Aliexpress UK
6way Fuse Box with 12 fuse blades & Label Stickers. 2 x MTA Midi Fuse holders. 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
500W Solar Panel System - 12V High-Efficiency Kit Dual USB & 100A Controller for RV Off-Grid Power & Battery Charging
Aliexpress UK