Customer Review

266 of 280 people found the following review helpful
5.0 out of 5 stars Lithium AA batteries are NOT the same as Lithium-ion Rechargeable, January 1, 2008
This review is from: Energizer L91BP-8 Ultimate Lithium AA Battery (8-Pack) (Health and Beauty)
[Updated on June 8, 2011]
Note: Amazon has moved two of my previous reviews (one for Energizer Lithium AA 4-pack, one for 8-pack) under one page. Therefore I have to update my review to add some new information - or else I look like a fool who says the same thing twice.

=== New information follows ===

There seems to be some confusion about those Energizer Lithium AA batteries. Several people have bought those batteries under the assumption that they are rechargeable, only to be disappointed later.

Despite the name 'Lithium', those Energizer Lithium AA batteries are very different from the commonly known 'Lithium-ion' rechargeable batteries. Namely:

- They are single-use batteries (NOT rechargeable like Li-ion)
- The terminal voltage for each cell is around 1.65V (compared to around 3.7V for each Li-ion rechargeable cell)

The two types of batteries are not compatible. If your camera accepts AA cells, then you should use those Lithium AA cells and not Li-ion rechargeable battery. Alternatively, you may explore other rechargeable battery options, namely:

1. Low-self-discharge NiMH AA cells, such as Sanyo Eneloop or Sony Cycle Pre-Charged. Those have a operating voltage of 1.25V per cell, so some cameras (especially those that use only two cells) may not operate correctly on those.

2. Nickel-Zinc rechargeable such as PowerGenix AA. Those have higher terminal voltage of 1.65V, same as that of Lithium AA cells. The down-side is that the higher voltage may cause some older cameras to burn out, and the NiZn cells themselves have very poor lifespan.

No matter which rechargeable option you pick, remember that they each need their own special charger. Choosing a good charger is the key to longer lifespan for rechargeable batteries.

I recommend most people to try eneloop cells first. They are the most reliable among NiMH batteries. If it doesn't work well for your camera, you can still use those celll in other appliances such as flashlights or Wii remotes.

Finally, it is a good idea to keep a set of those Lithium AA cells as backup, or in case or emergency. They can be kept in storage for ~10 years!
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Tracked by 3 customers

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Showing 1-10 of 12 posts in this discussion
Initial post: Dec 18, 2008 6:17:32 PM PST
NLee, I have been reading many of your reviews lately. Thank you, I am now purchasing the Rayovac charger (that big mother with 4 channels, etc.), and 2 packs of Sanyo Eneloop AA's. It's all for my girlfriends Nikon point-and-shoot camera that I got her a year and a half ago. I have since been using the Sony rechargables (2500 mAh i think, in the yellow/white package) with that travel charger, but we've misplaced the charger... also... I really seem to notice a big hit to the amount of time it takes the flash to re-load when those rechargeable Sony's get to the low end of their charge... In fact it's almost TOO long. It's too expensive for me to want to buy these batteries listed on this review. But can you tell me if the Eneloops will do the same thing as the Sony's? Should I just give up and go back to disposables until I get her a nicer camera that uses a proprietary Lion battery? Not expecting anything personal. The main question is this:

Do all (reasonably priced) rechargeable AA' NiMhs tend to suffer from extending the flash recharge time on point-and-shoot Digital Cameras when they get below a certain charge?

In reply to an earlier post on Dec 19, 2008 7:48:22 PM PST
Last edited by the author on Dec 19, 2008 7:50:26 PM PST
You should be able to use SANYO eneloop (or any other brands of low-self-discharge NiMH cells) in appliances that accept ordinary NiMH cells. There should be no difference in flash refresh time, as long as all your NiMH cells are fully charged and in good conditions.

If, for example, one out of four rechargeable cells is nearly exhaused, the combined terminal voltage would drop from 4.8 to 3.6V. That can explain why the flash refresh time becomes much longer.

Old rechargerable cells sometimes can develop higher internal resistance, which causes voltage to dip during heavy load. That will also cause flash refresh time to becomes longer, even when the cells are fully charged.

Posted on Mar 25, 2010 12:19:19 PM PDT
NomDePlume says:
Thanks for the helpful review. BTW, this battery (L91) lasts about three times longer than the Energizer alkaline (E91) in my wireless mouse (Apple Mighty Mouse - Bluetooth/optical), so I find it cost effective to use them there, too.

Posted on May 7, 2010 1:38:17 PM PDT
The other obvious use is for cold weather outing trips.

Posted on Feb 7, 2011 5:03:23 PM PST
WM says:
Thank you NLee the Engineer for a very good review.

I am considering these batteries for a remote outdoor temperature gauge/transmitter. Temps here can drop below negative 20. In order for my gauge to function accurately I must have lithium batteries for this transmitter to work below zero degrees. Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer

Posted on Feb 24, 2011 6:02:09 PM PST
PT says:
What kind of charger do you use for these types of batteries?

In reply to an earlier post on Feb 24, 2011 6:39:42 PM PST
NomDePlume says:
The L91 battery is not rechargeable.

In reply to an earlier post on Feb 29, 2012 1:49:13 PM PST
AnhMy Tran says:
However, when I search for "rechargeable" it shows up here.

In reply to an earlier post on Mar 16, 2013 9:35:11 AM PDT
AngelicA says:
I've used the same pair of L91s for two winters in Ohio (with the intervening spring/summer/fall) with nominal results. The battery alert light on the internal reader just lit up this last February. Rechargeables and alkalines were lucky to make it through one outdoor winter season much less a full year.

In reply to an earlier post on Jan 11, 2015 3:26:01 AM PST
Autymn D. C. says:
Prove it. What happens when I put the L91 in a charger?
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