Petzl Accu 4 Rechargeable Battery - $121.83

Upgrade your Petzl Ultra headlamp (sold separately) with this Petzl Accu 4 rechargeable lithium ion battery to give yourself up to an extra 2 hrs. over your current battery. 4,000 mAh Petzl Accu 4 rechargeable battery offers greater capacity than the 2,000 mAh rechargeable battery that is included with the Petzl Ultra headlamp. Battery provides up to 3 hrs. 15 min. of runtime on high, plus 45 min. of reserve power compared to 1 hr. 30 min., plus 30 min. of reserve power with the 2,000 mAh battery. Battery weighs just 4.2 oz. more than the 2,000 mAh battery. Lithium ion battery continues to work well at cold temperatures. Battery recharges in 5 hrs. using the Petzl Ultra Quick charger that is included with the Petzl Ultra and Petzl Ultra Belt headlamps; battery can be recharged up to 500 times. - $121.83