I'm an electronic tinkerer and would like to buy a variable power supply. At the same time I would like to keep the tractor's battery charged for the upcoming snowstorms.
Radio Shack has a variable p.s. that I have had my eye on since last year. It has a 10 amp capability (not sure at what voltage). So I'm wondering if I could use it to top of a battery or even recharge a battery. I'm aware that it wouldn't have the protection circuits that a battery charger would, so I would have to time it or keep an eye on it. I know battery chargers are relatively cheap, but extra money at this time is not present. I also hate redundancy and storage space is at a premium. Any suggestions or comments would be appreciated.

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