That said, here's what we want you to take away: The Energizer Ultimate Lithium is an amazing product. If you need a battery that you don't want to replace often, this is the thing. But while not having to change your batteries in your wireless system for a day on set is nice, the PHC doesn't justify it for us.

Energizer® Ultimate Lithium™ Batteries Nothing outlasts Energizer® Ultimate Lithium™ AA batteries. The Energizer® Ultimate Lithium™ batteries are not only the #1 longest-lasting AA batteries…they are complete with leak resistance and performance in extreme temperatures (-40ºF to 140ºF or -40ºC to 60ºC).

Ultimate Lithium batteries are long-lasting AA batteries, complete with leak resistance and performance in extreme temperatures (-40°F to +140°F or -40°C to +60°C).

Lithium is the lightest, most active metal. When this powerful metal is paired with iron disulfide, this energy is available at a voltage suitable for 1.5 volt applications. Energizer® successfully produced the first commercially available “AA” size 1.5 volt lithium battery in 1989.

In the last week, lithium prices have been widely discussed in the auto industry, and beyond, because the cost of metal necessary to make those batteries has been skyrocketing. According to Bloomberg, the cost of metal grew by 280% last year. In the first quarter, the prices of many metals more than doubled.

Safe, Stable Chemistry One of the most important advantages LiFePO4 has over other battery types is safety. LiFePO4 is the safest lithium battery type. It's the safest of any type, actually. Overall, LifePO4 batteries have the safest lithium chemistry.

The chemical reaction begins when the battery becomes part of an external circuit through which the electrons flow between electrodes. The lithium atoms release electrons to become positive ions (Li+); the manganese atoms gain them, thereby going from Mn4+ to Mn3+.

Energizer makes different types of long-lasting batteries: High quality Energizer MAX Alkaline AA, AAA, C, D, and 9V; Energizer Ultimate Lithium batteries, which are the longest lasting AA, AAA and 9V batteries on the market; Energizer Recharge, that are the most powerful and stable Ni-MH rechargeable batteries; ...

50.5mm Energizer Ultimate Lithium AA batteries benefit from a leak-proof construction, and are available here in a pack of 4. Energizer lithium AA batteries are also known as L91 or FR6 size batteries, and can replace types AA LR6 R6 HP7 UM3 MN1500 MIGNON. Length 50.5mm. Diameter 14.5mm.

up to 20 years Energizer® Ultimate Lithium™ AA and AAA last up to 20 years in storage, while our 9V lasts up to 10 years in storage. Energizer Recharge® AA, AAA, C, D, and 9V last charged up to 12 months in storage, with a battery life of up to 5 years under normal conditions for AA and AAA batteries.

The battery chemistry that powers every Energizer® alkaline battery is a precise combination of zinc, high-density manganese dioxide, and potassium hydroxide. An alkaline battery produces electricity when the manganese dioxide cathode is reduced and the zinc anode becomes oxidized.

In addition, the ultimate has a longer shelf life than the advanced (15 years vs 10 years) and, compared to the Energizer MAX, lasts 8x longer in a digital camera, whereas the advanced is said to last 4x longer. All info from the mfr, not from my own experience.