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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High-Capacity 13S2P 48V 7000mAh 18650 Lithium Battery Pack for Electric Vehicle Motorcycle DIY Kit with 15A BMS 54.6V 2A 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
36V/48V 11Ah~20Ah Battery 18650 Lithium Rechargeable Battery Built-in Bms for Silverfish 250W-800W Bafang Motor Kit with 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
For DJI Flip Battery Charger Two-way Charging Hub Vertical Butler Power Bank Charging Station Kit For DJI Flip Drone Accessories
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
high-capacity 24V/36V/48V 15Ah/ 20Ah/30Ah 4Pin 500W Bike Battery Pack Silverfish Lithium Ion for Conversion Kit with Charger
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
Neewer NP-FZ100 AC Power Supply Adapter and DC Coupler Dummy Battery Charger Kit Compatible with Sony A1, A9 II, A7R III, A7R
Aliexpress UK
Amperage: 140A. Product List: (7M). Heat Shrink Tubing: 6 pieces + 1 black heat shrink tube. ANS-H Fuse Box: 2 pieces. ANS Fuse Blades: 2 x 40A square head, 2 x 50A square head, 2 x 60A square head. Wire #1 Black: 1 piece - 1000mm, SC10-8 connectors on both ends, black heat shrink tubing.
eBay
20W 12V Solar Panel Kit with USB Output High Efficiency Solar Charger Panel Versatile Power Source Multipurpose
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
High-Power PD 100W Fast Charger Module 4S Battery Protection Board TFT Screen Digital Display Power Bank Board Electronic Kit
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
PG1050 Rechargeable Battery / LED 3-Slots Charger kit for 4k Action Camera AKASO EK7000, Brave 4, Dragon Touch 4K, APEMAN, EKE
Aliexpress UK