The battery will self-discharge long before a 2MA load will drain it. (one month or longer) The resistance value you're getting across the cables with them disconnected from the battery has to be an error or a meter set to an incorrect range. 1.75 ohms would cause a noticeable spark when the cables are connected, and that amount of current flow would drain the battery in a couple of days. It's more likely 1.75 K-ohms (thousands) if you're using an auto-ranging meter.

Try leaving the ground cable disconnected and putting an ice pick type test light between the negative battery post and ground. If the light glows, you've still got a parasitic drain somewhere.
Jerry

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