1x2 ENERGIZER Ultimate Lithium Mignon AA LR 6 1,5V

Battery Ultimate Lithium Lithium AA L92 2 pcs. Blister

It works up to 7x times longer in digital cameras.
It is the best battery for operation in extreme temperatures from -40°C to + 60°C. Incredibly long expiry date: 15 years. Low weight: 33% lighter than AA/AAA alkaline batteries. It has a very tight design thanks to NASA Space Engineers replacing all alkaline batteries on the Space Shuttle Discovery with Energizer lithium batteries.