Les piles au lithium AA/AAA ont de nombreux avantages : longue durée de vie (en général dix ans au fond d’un tiroir), forte capacité, légereté et insensibilité au froid.
Hélas, les lampes Petzl étant pour la plupart non régulées, elles ne peuvent supporter la plus forte tension (1.7 V) délivrée aux diodes.
Les seuls modèles de la gamme qui sont capables de les accueillir sans dommage sont :
- Gamme MYO : MYOBELT SB5 / MYO / MYOLITE.
- Gamme DUO : DUO LED 14.
- Autres : SAXO / MICRO / ZOOM Halogène.
- Lampes arrêtées : MYO 5, DUO LED 8.

Tous les autres devront se contenter de piles alcalines pour fonctionner sans risque. Dans le cas d’une utilisation de l’excellente Myo XP, il est à signaler qu’il existe désormais une version MyoBelt XP dont les piles peuvent être réchauffées par la chaleur humaine.
Cela dit, si le problème vient de la tension, il faudra se méfier également des surcharges d’accumulateurs, qui pourraient réserver de mauvaises surprises.
- Gamme MYO : MYOBELT SB5 / MYO / MYOLITE.
- Gamme DUO : DUO LED 14.
- Autres : SAXO / MICRO / ZOOM Halogène.
- Lampes arrêtées : MYO 5, DUO LED 8.
It seems there was trouble with dumb consumers in august, since a note of information about reversing batteries polarity was emited.
For people which work in subzero temperature, an alternative for using lithium batteries is the new MyoBelt XP, a deported batteries pack version of the very good Myo XP. The batteries pack can be wore close to the body in order to be heated and function flawlessly.
En discuter sur Grandes Poches.
Communiqué Petzl en français
Petzl information in english
Hat tip CPF
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One Response
Elizabeth McGregor
November 27th, 2006 at 4:14 am
1Hello
I have read these comments with interest and wanted to flag up some important points to you about the use of Lithium in headtorches.
The statement on the Petzl website claims that lithium batteries have a higher output during discharge which can cause the lamp to overheat. In a device Lithium batteries put out the same amount of power as regular batteries - the technology just allows the battery to do it for longer.
We have not seen any technical evidence to support Petzl’s claim and we have had no other issues or complaints regarding the performance of Energizer Ultimate Lithium in headtorches.
Energizer Ultimate Lithium performs extremely well in extreme temperatures (below 0 degrees), giving a better performance to users of headtorches in cold conditions. Lithium batteries are often best known for their performance in high-drain devices such as digital cameras and MP3 players, but also in high performance torches.
Below are a few key points about Energizer Ultimate Lithium.
Energizer Ultimate Lithium
- Performs well in extreme temperatures (from -40°C to +60°C)
- 33% lighter than alkaline AA
- The world’s longest lasting AA battery in high-tech devices
- Lasts up to 7 X longer in digital cameras*
- Takes up to 630 pictures** in a digital camera vs 90 photos with an alkaline battery
- Carries a 15 year shelf life
- Lasts up to 5.5 hours longer than leading ordinary alkaline batteries in MP3 players
- Up to 12 CD player hours
* Based upon ordinary alkaline in proposed industry testing. Results may vary by camera
** NCIEC digital camera test, results may vary by camera
Elizabeth McGregor
Marketing Director
Energizer UK
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