Multiple batteries?

[spannerrash]

Hello all

My car is pretty much a weekend / dry weather vehicle. Consequently it tends to spend a lot of time stood on the drive during the winter. This forces me to have to keep changing the battery, on the car and out on the drive.

I don't want to leave the car with a disconnected battery as I want the alarm to still be functional.

Would there be any problems with connecting two batteries to the car in parallel (positive to positive, neg to neg)? In theory, in my mind anyhow, this would double the capacity of the system.

I realise this would then take twice as long to change when needed but as I have 2 chargers I can do 2 at once if I separate them.

Do I have a win win here, twice as long to discharge but the same amount of time to recharge?

I suspect things are not that simple but please let me know what you think.

I would certainly not run the car with this configuration.

Thanks Frank