12v battery options

[J1nx]

I’d consider a simple tool battery, just get something like the Milwaukee 12V high power battery and charger. All self contained and safe, no faff. My only concern is the protection circuit may be lower than 20A but if you get the larger battery with 6 (2x3) cells then it’s easily inside the actual cells discharge capability.

Edit, obviously you’d need to buy about 3 and swap out if you actually need 20Ah of storage.

 

[8ob]

Whats wrong with a booster starter pack Its all in there, batteries, charge indicator, charger and can be charged off the car on the hoof.

 

[cheb]

Could you use a UPS? Built in charing a protection and if you're out it won't be needed at home and vice versa.