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Eneloop Shelf Life

Discussion in 'Survival/Preparedness Forum' started by Lone Kimono, Aug 1, 2012.

  1. Lone Kimono

    Lone Kimono

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    Does anyone know what the shelf life is of new, unopened, Enloop batteries? I'd like to store some away, but not if they won't be good when I need them.
     
  2. Babynine

    Babynine

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    I think I have read of someone on CPF testing a 6 year old unopened package of Eneloops, and they still held a decent charge right from the package! They were only rated to hold a charge for a year or two, but they seem to do much better than that.

    I have only been using them for 7-8 months, and I have not seen any voltage drop from them in that time from storage. The Goal Zero LSD AA cells I have seem to test out to a higher capacity than the Eneloops, but I have seen a small voltage drop over only 4 months. Both are rated to 2000mah, but the Goal Zero AA cells I have tested out to about 2200mah. I prefer the Eneloops.

    Remember that Eneloops only come with a 70% charge from the factory, so you would likely be better off charging or doing a break-in cycle before storing them, but I cant be sure.
     

  3. kirgi08

    kirgi08 Watcher. Silver Member

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    I also saw that Duracell is offering a 10yr guarantee.That is forth coming.'08.
     
  4. humanguerrilla

    humanguerrilla

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    wonder about the 2500 mah eneloop xx
     
    Last edited: Aug 2, 2012
  5. rwrjr

    rwrjr

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    I have about one dozen of the AA Eneloop, all purchased over the last 2-3 years. When we had the big multi-day power outage a few weeks ago they were all deader than door nails. I tried many pairs in my portable radio since all comms were down the first day and none worked. Fortunately the radio also has a dynamo w/crank.

    After the power came back on I recharged them and tested in the radio to make sure the issue wasn't with the radio itself. After recharge they worked fine.
     
  6. KeithS

    KeithS CLM

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    I have a couple dozen. I believe the packaging said they would be at 75% after 3 years. You could verify on their website.
     
  7. rwrjr

    rwrjr

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    What the package or website says doesn't really matter. Give yours a try after sitting for a couple of years. Who knows, maybe I have a batch that don't hold a charge. I do use them in a lot of things though. Whenever I swap them out I put the discharged batteries in the charger overnight and put them back in the kitchen drawer when charging is complete.
     
  8. cowboy1964

    cowboy1964

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    Rechargeables need to be exercised, IMO. If you let them sit for years they simply will not be the same. In my experience anyway.
     
    Last edited: Aug 2, 2012
  9. Chucktown Mako

    Chucktown Mako G23

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    I bought a set of both AA's and AAA's from Costco a couple months back, but they didn't come with a charger. What's everybody using?

    There is a good review of the batteries/charger on amazon. Pretty detailed testing the guy did. It's the first review on the list here:

    [ame="http://www.amazon.com/Sanyo-Eneloop-Charger-Rechargeable-Batteries/dp/B003VLAEPQ/ref=sr_1_3?s=electronics&ie=UTF8&qid=1343940826&sr=1-3&keywords=eneloop"]Amazon.com: Sanyo Eneloop Ni-MH Charger and 8 Rechargeable AA and 4 Rechargeable AAA Batteries: Electronics@@AMEPARAM@@http://ecx.images-amazon.com/images/I/31L1Nx4DN4L.@@AMEPARAM@@31L1Nx4DN4L[/ame]



     
  10. bdcochran

    bdcochran

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    Thanks for starting the thread.

    FYI - the literature says that the batteries have to be put through a special cycle before charging. I did that with one set that I use in a super flashlight kept by the front door.

    The literature says that the batteries come with less than a full charge and are supposed to have a 70% charge after 3 years. Then I started thinking. Well, the three years doesn't start from date of purchase. Ok, so does it mean 3 years from date of manufacture? Then, I concluded it must mean 3 years from the date of the special cycle of the purchased batteries. Aaaaah!

    So, last night I ordered a large number of Red Chinese aa/aaa battery holders. They are plastic and hold the batteries separately in compartments. Purchased on ebay. I now with start putting every battery through the special cycle, fully charge them, mark the date that I put them in storage.:wavey:
     
  11. RWBlue

    RWBlue Mr. CISSP, CISA CLM

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    It use to be true, but not anymore with Envelops and simular batteries.

    As far as a recharger, PowerEx MH-C9000 WizardOne Charger-Analyzer is suppose to be the best.

    The one I bought is cheaper, but should have the same features.
    The one envelops come with is not a smart charger.
    The Goal zero Guide10+ is not a smart charger.


    Can someone post the procedures for storing envelops for long term. If my black envelops came with a manual it has been lost.
     
  12. Lone Kimono

    Lone Kimono

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    I purchased a bunch of the sets from Costco as well. If they only last 3 years I'm going to take some back and buy them down the road.
     
  13. RWBlue

    RWBlue Mr. CISSP, CISA CLM

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  14. RWBlue

    RWBlue Mr. CISSP, CISA CLM

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    Charge them once a year. They should stay very well in storage for a year.
     
  15. Bolster

    Bolster Not Ready Yet!

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    I have 2006 vintage Eneloops that got very little use, and they're still going strong, many around 90% capacity.

    BUT as others have said, this is not how you treat Eneloops, ideally. You want to use the Refresh and Analyze mode on a Maha C-9000 about twice yearly to keep them in top condition.

    Also, after charged, if storing, then DIScharge them to about 70% capacity. It's actually better if an Eneloop is not stored at full charge. Notice when they come new in package they are generally around 70%, depending on how long they've been on the shelf, and that's done on purpose from the factory. See CPF if you want more explanation on this one.

    I learned this the hard way: When an Eneloop loses some capacity, be sure to adjust your charge rates for the NEW (lower!) capacity! I kept charging some oldies as if they had full capacity and I reduced their capacity even further that way.

    Many arguments about refrigeration or not. Appears to have a negligible effect on Eneloops, so I don't. But don't store them in a warm place, obviously.
     
    Last edited: Aug 3, 2012