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
54.6V 3A Lithium Battery Charger 48V 13S Kugoo G1 Charger High quality Li-ion Battery pack 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
Replacement Charger only For Hitachi 12V NiCd Ni-Mh Battery Charger Pod Style Battery Charger for
Aliexpress UK
Easy 3 wire connection at the battery. No need to bypass existing alternator wiring. VSR have no volt drop. Conventional diode isolators incur a minimum of 0.6 volt drop. Compact size - No large heat sink Cost effective solutionQuality products.affordable prices.
eBay
Solar Panel 500W 5000W 10000W Perc Split Half Cut Cell MBB Solar Battery Charger Solar Home System
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
12V 2A Car Battery Charger Digital Display Motorcycle Battery Charger Battery Trickle Charger
Aliexpress UK
Automatically combines two batteries 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
4 Slot Battery Charger LED Light Power Display Battery Charger for 1.2V NiMH AA/AAA Battery Charger
Aliexpress UK
Bought for a project but never got used. Has been stored in a box.
eBay
12V 24V Battery charger diesel generator battery float charger 6A lead acid battery 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
Car Motorcycle Battery Charger Digital Display 12V 2A Battery Charger Battery Trickle 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
58.8V 4A Li-ion Battery Charger 14S 52V 4A Charger Kugoo G1 Charger Lithium Battery Pack Charger
Aliexpress UK