"the Core battery pack might be lighter than 3 AAA batteries"
even if it were heavier the functionality gained would make it worth it. This mod makes using the power sucking high beam a no brainer as I know how long the usable light will last (not to mention it has a 3 stage power gauge on the unit). Just happens to be a side benefit that you do not have to throw anything away. At my going rate I figure I will probably charge it 5-10 times this winter. Once March hits and the sun comes back out I am guessing a single charge will last me till Fall. Lets just hope it lasts as long as Petzl claims.

