Looks like a good lesson to learn.

....προσοχή και στα κινητά και τα υπόλοιπα με μπαταρία. Δεν τ'αφήνουμε στον ήλιο

I bet this also applies to Cell phones, tablets, digital  cameras, and other devices that use lithium batteries. You think this may be a reason why the US Postal Service will not ship electronic devices that contain lithium batteries any  longer?        GPS was placed in its bracket in  the windshield and left in the sun. The battery  overheated and exploded !  Look at the damage !