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Message: <blockquote data-quote="Theo98" data-source="post: 3490035" data-attributes="member: 132099">Lithium AA (non-rechargables) are recommended by Canon for the 2005 10x42L IS and give the longest run time with operation (8 hrs continuous IS usage @ 25 degC). Info is located both on-line and with the new unit I just received. Canon Tech this morning stated they don't recommend Lithium-Ion rechargeables, as they do have some questionable safety issues. See <a href="https://en.wikipedia.org/wiki/Lithium-ion_battery" target="_blank">HERE</a>, [Lithium-ion batteries can be dangerous under some conditions and can pose a safety hazard since they, unlike other rechargeable batteries, contain a flammable electrolyte and are kept pressurized], located @ top of page, last paragraph.  Additionally besides alkaline batteries, NiMH rechargeables (like the Eneloops) at 25% less run time over Lithium (non-rechargeable), are also recommended!Ted</blockquote>