There are a few possibilities.
The owners manual states that any time the PT will not be driven for 2 weeks, the IOD ignition off draw fuse should be pulled to keep the battery from going flat.
The OEM Mopar subwoofer has a TSB concerning constant power draw. There is a relay mod from Mopar to cure this. It will drain a battery in about 5-7 days without the fix.
Leaving a cell phone or some other portable device plugged in over night can also effect the battery. It's easy to forget about something, and it's hard to fess up and take the blame.
If those items are ruled out, the tech needs to check for a parasitic drain. This is a small power drain, commonly called dark current.
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