75ma is a negligable amount of current. That's .075 amps. At that rate, a 60 amp hour battery would last 800 hours. So, perhaps you are not reading the meter correctly. If you are reading correctly, than that current would be acceptable, as some keep alive current is required by various electronic components, like the radio, alarm system, remote door locks, clock, and engine control computers. Get a real amp meter capable of reading up to 5 amps directly. For a good battery to go down quickly, the current draw will be very high. Most likely cause of a bad battery, even a near new one, is a bad battery. Internal resistance is to blame.

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Resistance is Futile.