A rechargeable version would have garnered 5 stars, because in taking it apart to investigate the battery and how to replace them (as there are obviously 2), it was kind of a pain getting it back together and lining everything up. Function-wise it's an ingenious product, but being an aircraft electrician, I will use them around 6hrs every day, so I'm a bit apprehensive as to the longevity of the battery life. I cycle through both of my rechargeable headlamps multiple times a day, using one while...