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
3.7v for Wltoys V911 Charger H36 Charger E010 F929 Battery conversion Cables Set for Syma X5C Syma X5SW Drone RC Quadrocopter
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
New DIY High Quality Hello Kitty Charger Data Cable Case Protector and Winding Kit for Apple 18W 20W Charger Adapter
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
Original Xiaomi 33W Fast Charger Full Kit Type-C Cable Wall Charger For Mi 10 9 10T Lite POCO X3 NFC Redmi K40 Note 9 10 Pro
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
2025 Magnetic Wireless USB A Fast Charger set for Apple Watch Ultra Series 10 9 8 7 6 SE Type C Cable Charger Stand Fast Charing
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
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
5Pcs Charger Cover Data Cable Protective Cover Set Cute Cherry Patten for 18W/20W iPhone USB Wire Charger Saver
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
30W Solar Charger System IP65 Car Battery Solar Panel Charging Kit 18V Solar Battery Charger Board For Car RV Boat Motorcycle
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
Conector Motorcycle Power Outlet Splitter Kit USB Charger Cable Set With Port Splitter Kit For Yamaha Tenere 700 Super Tenere
Aliexpress UK