Battery Drain, battery and systems check OK?!

Car did not start (2007 Honda CRV).

Car got new starter.

Later, car did not start again, sounded different, no clicking…

Mechanic did a systems check with the machine with a fresh battery. Systems check came back OK but battery drained.

Any ideas??

If you are sure the battery was low on charge instead of having a problem with power not getting to the ignition and starter system then you need to check for a current drain using an ammeter. I’m not sure what kind of testing was done with the ‘systems check’.