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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Standard Battery Charger Opus BT-C3100 V2.2 Digital Intelligent 4 Slots AA/AAA LCD Battery Charger tool parts
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Built-in LED indication ( lights up when VSR starts ). when charging and isolates the two batteries when not charging,which can widely used in 12v camper van trucks, caravans, and camping applications.
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54.6V 5A 2A 3A 8A 10A Lithium Battery Charger 300W XT60 XLRM Used for 13S 48V Li-ion Battery Pack Smart 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
DCB104 Li-ion Battery Charger 4-Port 2A Current For Dewalt 10.8V 12V 14.4V 18V 20V 60V DCB127 DCB105 DCB118 DCB112 DCB119 DCB102
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.
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LiitoKala Lii-D4XL 21700 Battery Charger For 18650 18350 26650 16340 14500 3.7v 1.2V 3.2V Ni-MH/Cd,AA AAA SC D C battery charger
Aliexpress UK
BATTERY CUT OFF SWITCH AND TWO RING TERMINALS 25mm² Supplied with 2 keys. 12 or 24volt 280Amps Continuous operation Heavy Duty 2 x Ring Terminals 25mm²: 6.70mm Internal Diameter Useful when you have a battery drain or going on holiday for a long period of time. Also good for Vans Trucks Caravans Motorhomes FAST FREE UK DISPATCH.
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TANGSPOWER 54.6V 3A Lithium Battery Charger For 13Series 48V Li-ion Battery Pack Charger High quality With Cooling Fan
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Manufacturer: Victron Energy. Awnings, Rail and Brackets. Continuous Output Current: 30A. Seat Plates. Here to give You the Best Experience. We have not authorised a signature release (for your parcel to be left anywhere, unsigned for).
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PUJIMAX 8 Slots AA/AAA Rechargeable Bsatteries Type-C USB Universal Battery Charger Adapter Battery Charger For Power Accessori
Aliexpress UK
When charging and isolates the two batteries when not charging,which can widely used in 12v camper van trucks, caravans, and camping applications. When your engine is switched off, the relay will isolate your leisure battery(s) from your main starter battery.
eBay
60A 14.6v Lifepo4 Charger 0-15V Adjustable Battery Charge Car Fast Charge Lithium Battery Charger 12.6V High Power Adapter
Aliexpress UK
2 x 13A 240V Plugs with protective back-boxes. The 240V Sockets must be connected to either an external hookup or an inverter. Neither of these are supplied with the unit. 5 x 12V 20 Amp Switches with Blue LED as standard.
eBay
BMS 20S Lithium Battery Charger Protector Module 48 V Wiring Detection Light Board Lithium Battery Charger Protection Board
Aliexpress UK