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 Bosch Battery Charger 2A 18V 14.4V Li-ion Battery Charger For BAT609 BAT609G BAT618 BAT618G Charger AL1860CV AL1814CV
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 2A Lithium Battery Charger 14S 52V 2A Li-ion Battery pack Charger Fast Chargeing XT60-XT90 Power Tool Charger
Aliexpress UK
Output: 12V. 1 x UK Plug. 1 x Battery Clamp Connectors.
eBay
54.6V 2A Lithium Battery Charger 48V 13S Kugoo G1 Charger High quality Li-ion Battery pack Charger With Fan
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
54.6V 3A Lithium Battery Charger 48V 13S Kugoo G1 Charger High quality Li-ion Battery pack Charger With Connectors 100-240V
Aliexpress UK
The Sargent PX310 can be safely left switched on as required. It provides power for both battery charging and 12-volt appliances. The integrated LCD display shows battery charging status and allows setup for different battery chemistries.
eBay
54.6V 2A Lithium Battery Charger 48V 13S Kugoo G1 Charger High quality Li-ion Battery pack Charger With Fan input 100-240V
Aliexpress UK
Specifications: Input: 220V Output: 12V Charging Current : 30Amp Size :185*105*60（mm） Colour:Blue Model:Battery charger Package Includes: 1 x Battery Charger 1 x Battery Clamp Connectors 1 x UK plug 1 x adhesive tape.
eBay
54.6V 2A Lithium Battery Charger For 13S 48V Li-ion Battery Pack Fast Charging Electric Bicycle Charger Power Tools Charger
Aliexpress UK
UK Standard 3 Pin Plug Adaptor. Does not require manual disconnection after charging. Wrong polarity and short circuit protection. Bungs (Plugs) are only for transportation use. INHALATION - Remove from exposure, rest and keep warm.
eBay
USB Charger For Sony NP F550 NP-F550 NP-F960 NP-FP50 NP-FH50 NP-FV50 Battery Charger For Sony NP-BN1 BN1 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
54.6V 3A Lithium Battery Charger 48V 13S Kugoo G1 Charger High quality Li-ion Battery pack Charger With Connectors
Aliexpress UK