(really) stupid question: are the two power outlets(left and right of USB port) identical? One on the right is covered and marked 12 V, the other one not covered, not marked. Do they require the same car charger to be inserted? I used the one on the right just fine, but the other one somehow did not accept the charger so easily and I was afraid to push/force. Also, the inside of the two "holes" looks a bit different on close inspection?
