In the description for the Petit Crouton it says:

"Power supply : 5.5 to 11 V / 2.5A (with the High-power LED). 2 li-ion cells (18650 or 14500) batteries recommended."

My question is this. 18650 is used in the name of both 3.7V and 7.4V batteries. With the 5.5 to 11 V (at the beginning of the power supply requirements stated for PC), does that mean a 7.4V battery is needed? It was just a tad confusing, and I wanted to make sure before I made a purchase.