To find out if the battery is being discharged through some external source you would need to set your meter to read Amps and then connect your meter in series with the connection. This will mean taking the connection off the battery and then connecting one meter lead to the battery and the other meter lead to the lead you have just removed from the battery. If you aren't confident with all of this don't attempt it.
NOTE: The meter needs to be capable of reading Amps and must be set to the highest setting first and then turned down if required.
With everything turned off there should be little or no current flow showing
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