Here's a quick look at the primary rechargeable options from two major headlamp manufacturers.
|The Tikka RXP from Petzl|
Both recharge via a short USB cable; a full charge takes 4.5 hours, per the Petzl specs. Burn time on a full charge ranges from 2.5 hours to 12 hours, depending on the brightness and settings -- comparable to their non-rechargeable equivalents. (It's worth noting that the classic Petzl Tikka provides more than 120 hours of light, albeit less bright, on a single set of batteries)
Drawbacks include the fact that the R+ and RXP are about an ounce heavier than their non-rechargeable counterparts, and -- more annoyingly -- require that you purchase a separate accessory ($10) if you want to use them with AAA batteries instead (a likely scenario on longer multi-day trips).
|The Black Diamond ReVolt|
It lacks the automatic lighting adjustments and is less bright (130 lumens) than the Petzl models, but lasts a lot longer on a single charge (80 - 190 hours, depending on brightness) and costs less to boot ($59).
The bright choice is up to you.
“Equipped” is an AMC Outdoors blog, written by Matt Heid.