Core is rechargeable via a USB-cable. It adds to the size and weight of the headlamp a little, but not ttoo much to notice really.
The normal battery compartment for three alkaline AAA-batteries remains usable, just in case you need it.
In many European trail ultras the competitors are required to carry two headlamps and extra batteries for both. That's why I want a headlamp that's not too heavy.
Tikka XP2 is bright enough for slow trail running with 60 lumens and it weighs 88 grams (including the Core battery or 3 x AAA-batteries). I believe it is the lightest rechargeable and programmable headlight available.
I downloaded the free OS by Petzl software and programmed and tested my Core with it. It worked well on my iMac and was easy to use.
I programmed the Max mode as Regulated (full power for 4.5 hours) and the Eco mode as Non-regulated (the standard mode with declining power as time goes by).
Finally here are a couple of videos by Petzl. Core really seems to work as advertised, although I haven't really tested it in tough conditions like a race yet. However I like it so far and would recommend it.
I think the price should be a bit lower. I paid 32€ for my Core battery alone. My Tikka XP2 cost about 45€. They are now also selling Tikka XP2 Core with everything in same package.
CORE [english] Rechargeable battery for TIKKA² headlamps from Petzl-sport on Vimeo.
The new rechargeable CORE battery is designed for the TIKKA² - ZIPKA² line of headlamps.
This battery is easily inserted into the headlamp in a few seconds instead of three regular batteries. It offers an advantage over standard batteries for frequent or intensive headlamp use. It is more economical to use - it pays for itself after four sets of alkaline batteries.
The Lithium Ion Polymer technology guarantees a lifetime that is equivalent to 900 regular batteries - the CORE battery makes an efficient contribution tolimiting toxic waste in the environment.
The CORE battery takes advantage of the high performance of Lithium Ion Polymer technology, particularly of its excellent functioning in lower temperatures.
The CORE battery has a USB connection, so it can be recharged from any standard USB charger: a cell phone charger, a multimedia device, a solar panel, a portable energy source, a computer, etc.
With "OS by Petzl" software, the CORE battery opens new doors: the "OS by Petzl" software can simply be installed in your computer and the headlamp connected to it. It then becomes possible to adjust, in a very intuitive way and with only a few clicks, the battery life of the headlamp or the lighting level (maximum or economic mode) according to your needs.
OS by Petzl software demo from Petzl-sport on Vimeo.
OS by Petzl software allows you to configure the CORE rechargeable battery and personalize the performance of your TIKKA2 - ZIPKA2 headlamp.