Cycling a car battery

[nottoooily]

Hi. I want to drive a 20-50A 12V motor for less than 1 hour.

Does anyone know how many charge cycles I'd get out of a cheap car battery doing this to it? I realise it won't be good in the long term, but I'll be happy it if lasts a couple of months with 1 cycle per day.

This is only a temporary project for fun, so I don't want to pay any more than I have to just to make it last.

[Admin]

Hmmmm perhaps check the battery datasheets? Im not sure, but Im willing to bet its less than 100 deep cycles.

[dunk]

so car batteries are not designed for completely discharging.
you want a deep cycle battery. these are commonly used for the passenger electrics on boats and RVs. you can completely discharge this kind of battery with little damage.

dunk.

[nottoooily]

As I said, I don't want to do that.

I've since found 3 old batteries so I'll test them to destruction.