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
Real capacity DC 5V 12v Backup battery 6000mAh/7800mAh/10050mAh Lithium Li ion Battery pack Mobile power With 5521 cable charger
Aliexpress UK
Maximum solar input current: 20A. 1 x 500mm RED 70amp READY MADE cable Relay to fuse holder lead. Compatible with Multiple battery types : AGM, GEL, Flooded, and Lithium. 2 x 250mm RED 70amp READY MADE cable from Battery to fuse holder lead.
eBay
Rechargeable Battery Charger 10.8V 12V AC100V-240V for Makita Power Tool Lithium Replacement battery BL1014 BL1013 EU Plug
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
LiitoKala Lii-M4 Battery Charger 18650 21700 18650 3.7V 1.2V 18350 18500 25500 26650 AA/AAA NiMH Li-ion Battery
Aliexpress UK
eBay
12V LiFePO4 80AH/100AH/120AH battery 12.8v lithium iron phosphate battery 120ah 100ah waterproof for boat motor with 10A Charger
Aliexpress UK
With an all-new design featuring a clear, easy-to-read display and compact form factor, the 900 is perfect for maintaining seasonal vehicles, motorcycles, caravans and more. The included o-rings provide an option for a more permanent connection to your vehicle, while the convenient quick-release cable ensures polarity is never mistakenly switched.
eBay
3000mAh 12V Rechargeable Battery For Makita PA12 6270D 6271D 6227D 6317D 8270D 1220 1222 1233 Power Tool Battery And Charger
Aliexpress UK
It does this by adding a solar operation to the product both when the vehicle is in motion and moreover when the vehicle is stationary. This makes it, in effect, also a free 350W solar regulator when the vehicle is stationary.
eBay
2PCS AAAA Rechargeable Battery Stylus 1.2V 400mAh AAAA Ni-MH Rechargeable Battery with Charger
Aliexpress UK
Maximum solar input current: 20A. Compatible with Multiple battery types : AGM, GEL, Flooded, and Lithium. 1 x 500mm RED 70amp READY MADE cable Relay to fuse holder lead. 2 x 250mm RED 70amp READY MADE cable from Battery to fuse holder lead.
eBay
AL1411DV Ni-CD Ni-MH Battery Charger for Bosch 7.2V 9.6V 12V 14.4V Battery GSR7.2 GSR9.6 GSR12 GSR14.4 Electrical Drill
Aliexpress UK
Maximum solar input current: 20A. 1 x 500mm RED 70amp READY MADE cable Relay to fuse holder lead. 7m kit includes everything you need for setup dual battery charging system 2 x 250mm RED 70amp READY MADE cable from Battery to fuse holder lead.
eBay
1-5PCS LiitoKala Lii-PD2 18650 Battery Charger for 3.7V Li-ion 18650/18500/16340/26650/21700 /20700/18350/CR123A 1.2V battery
Aliexpress UK