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.

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.

Are Lithium batteries safe? Lithium batteries are rigorously tested against a wide variety of abuse scenarios, including battery reversal, forced discharge, charging, direct short, crush, impact, shock, vibration, dip in water and high temperature storage.

Energizer Ultimate Lithium batteries are lithium metal batteries. Unlike lithium ion batteries, they are non-rechargeable. Every battery works via chemical reactions.

A typical charge or use cycle for a lithium-ion battery is 8 hours of use, 1 hour to charge and another 8 hours of use. No cool down period is needed. This allows the battery to be used continuously throughout a 24-hour shift, with downtime occurring only during short periods of opportunity charging.

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.

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).

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).

LiFePO4 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.

Yellow light - Charging is 50% complete and charging. Green light - Charge is complete and batteries are 100% full; audible beep upon completion. Bad Battery Detection Alert - If a bad battery is detected a red 'x' will illuminate; repetitive audible beep upon detection.

between 2 to 10 years The length of time a Lithium-ion battery can last without charging depends on several factors, including the capacity of the battery, the device it's in, and how much power the device is using. On average, most Lithium-ion batteries can last between 2 to 10 years without charging, depending on how they are stored.

A lithium-ion battery can easily be stored for a year; just make sure it has some charge, ideally 50 to 60 percent, before putting it away. If you store the battery with some charge, it will last longer before self-discharge gets the voltage near the danger point.