Its possible that after 10 days the battery is flat ,but this depends on the age of the battery .
If battery is new you may have a little battery draw in the system .you need to check how many amps are being drawn from the system anything over Ma will drain a battery in 3 weeks but if only 60% charged we are talking about a few weeks .so all depends on your battery .
First you need to check what the actual battery drain is when the ignition is off and after 30 minute wait .
Have this checked by an electrician.
But two weeks i would say just an old or weak battery have battery tender fitted for when you have the car stored for over 1 week..
This tender will keep your battery alive for a long time .
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Kind regards Greg.