[harley]

While I am not familiar with the Secret Audio product - the easest check would be to connect an ammeter in series with the battery. If the current draw is really under 1 amp - a 50 amp-hour load should not deplete the battery unless the battery is defective or not fully charged to begin. A current to maintain memory is normally very very little - milli amps range (.001 amp)

If the draw is under an amp i would check the condition of the battery if over an amp i would try and find the power user. I would guess something is maintaining a draw - i.e the power amp is always on - good luck -

jim