In relatively quick succession two family cars decided to have flat batteries namely the MK 1 and the Datsun 120Y. There was no basic reason for this problem as both vehicles had relatively new batteries. Both were recharged and the MK 1 had the battery lead removed from the battery terminal.
About two weeks later I went to start the Datsun but only got a very weak starter and no inclination to fire. I promptly hit it with jumper leads and it started and run normally. However this loss of electrical power was a problem that needed solving. I connected the multimeter on amps range between the battery and the lead and noted a very slight drain of under 1/10 of an amp. In fact it was about 80 Ma. Now that is not a high discharge as 80 Ma equals 80 thousandths of an AMP.