Petzl saw all the kids (and woke old folks) walking around with their reusable shopping bags, straws, and coffee cups, and they decided to join the party. With the Petzl CORE headlamp battery, simply plug your batteries into a charger the night before a big adventure and voilà, start the next day knowing that your headlamp won't quit before you make it back to the car. No longer will avid pre-dawn or post-sunset skiers have to buy 75-packs of AAA batteries from Costco at the start of each season. No longer do you have to frantically dig in 8 feet of snow after dropping all three of your spare batteries because your headlamp went dark 45 minutes after sunset. No longer do you have to try and remember if the batteries in the left cup holder or the right cup holder were the ones with a partial charge left. Today is the day that your headlamp batteries go green, with the Petzl CORE rechargeable headlamp batteries.