Test/Review of Energizer Ultimate Lithium AAA (L92)

Batteries and Chargers Consumable Batteries
1

Energizer Ultimate Lithium AAA (L92)


Official specifications:

  • Last up to 9x longer in digital cameras (versus Energizer® MAX®. results vary by camera.)
  • Weigh 1/3 less than standard alkaline batteries
  • Perform in extreme temperatures from -40°F to 140°F
  • Hold power for 15 years when not in use
  • Leak resistant construction
  • Classification: "Cylindrical Lithium"
  • Chemical System: Lithium/Iron Disulfide (Li/FeS2)
  • Designation: ANSI 24-LF, IEC-FR03
  • Nominal Voltage: 1.5 Volts
  • Storage Temp: -40°C to 60°C (-40°F to 140°F)
  • Operating Temp: -40°C to 60°C (-40°F to 140°F)
  • Typical Weight: 7.6 grams (0.3 oz.)
  • Typical Volume: 3.8 cubic centimeters (0.2 cubic inch)
  • Max Discharge: 1.5 Amps Continuous (single battery only) 2.0 Amps Pulse (2 sec on / 8 sec off)
  • Max Rev Current: 2 uA
  • Typical Li Content: Less than 1 gram
  • Typical IR: 140 to 180 milliohms (depending on method)
  • Shelf Life: 15 years at 21°C




Due to the small size, these batteries are limited in current, but they are much better than alkaline.
Like other lithium cells the voltage is 1.8 to 1.9 volt when unloaded.











Up to 1A the batteries works very well.









Conclusion

Compared to alkaline this battery is very impressive, at least at higher current (Below a few mA load alkaline will probably match it). The long storage time and good performance in cold weather is also a advantage of lithium.



Notes and links

Cold weather performance is considerable worse than perforance at 25°C, but it can deliver some power down to -40°C.

How is the test done and how to read the charts
Comparison of AA battery chemistries

2

Thanks for the review, these are nice batteries for emergency flashlights.

I take it that you have a -40 available somewhere for battery testing?, that is pretty uncommon.

3

Not really, but I can read a datasheet.

4

I have these in a couple of emergency 3AAA flashlights in the house.

They’d be expensive to run in your main light though - when I had an LED Lenser T7 I used Turnigy 900mAh LSD NiMH.

5

ah, was just wondering

6

I would have liked the possibility, but I am a bit pressed for space.

The actual data for low temp. is about the AA cell, not the AAA, but the difference will only be different mAh and mA, the curves will be the same.

At -40°C it can deliver full capacity at 25mA load, at 250mA load the capacity is around 1300mAh (AA cell). It s especially below -20°C the load ability goes down. Alkaline and NiMH is mostly dead at -20°C.

7

I guess in a flashlight they will warm up pretty quick when it’s turned on for any length of time.

8

What about at –40°F? :wink:

9

nah, at that temperature the battery will go on strike demanding higher pay and better working conditions :nerd_face:

it does not have any intelligence to know they are one and the same

10

These are very nice batteries. I always find energizer batteries very reliable.