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Eneloop battery life? #4966827 01/01/19 11:41 AM
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Klutch9 Offline OP
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Just bought some standard AA 2000 mAh Panasonic Eneloops for my Xbox controller, since it eats the alkalines in less than a week. I got the Eneloop brand because of the proven low self-discharge and number of recharge cycles, but how long are they actually rated to last in years? I can't really find any good data on this; maybe there isn't any. Will they last decades potentially, if they haven't hit the maximum number of charge cycles at that point? I know alkaline chemistry is different, and most of them have a rated life, usually 5-10 years after manufacture date, then they expire. I'm assuming since NiMH batteries are rechargeable, their life is limited by charge cycles (and potentially use), rather than time.


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Re: Eneloop battery life? [Re: Klutch9] #4966832 01/01/19 11:43 AM
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tomcat27 Offline
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I have used eneloop batteries for about 4 years in my camera flashes. (semi-pro; I've shot approx 60k photos in that time) life of the battery depends on the quality of the chemistry. so far good - but not very old yet.


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Re: Eneloop battery life? [Re: Klutch9] #4966840 01/01/19 11:51 AM
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I have dozens of eneloop AA batteries that I’ve used for years in metal detectors and trail cameras. Can’t put a number on their life expectancy because they are all still going strong.

Re: Eneloop battery life? [Re: Klutch9] #4966842 01/01/19 11:52 AM
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danez_yoda Offline
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battery life is based on charge cycles, also epth of discharge and charger quality. Cheap chargers overcharge the cells and partially damage them. No battery manufacturer will tell you how to make their batteries last forever or they would be out of business. Just look for user guides on battery maintenance and you should be fine for a long time,

Re: Eneloop battery life? [Re: Klutch9] #4966845 01/01/19 11:58 AM
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Errtt Offline
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I use Eneloops (AA & AAA) for most of my applications. I don't recall any life in years (time), only in charge/discharge cycles.
I like chargers that show each battery capacity. When I find one that doesen't have the capacity as the rest by a set margin then cull it out or use it in another application where shorter run time is not much of a concern.
Some chargers can discharge then recharge and display the mAh capacity, others may show charge mAh but if the battery wasn't discharged then it would only read how much was put in to termination.
Candlepower forum has been my go-to regards to reviews of not only batteries, but flashlights, chargers etc.

Re: Eneloop battery life? [Re: Klutch9] #4966849 01/01/19 12:00 PM
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eljefino Offline
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I have some that are around a decade old. I don't use them all that often but they do work quite well.

AmazonBasics are rumored to be the same thing.

Re: Eneloop battery life? [Re: Klutch9] #4966854 01/01/19 12:05 PM
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Decherdt Offline
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According to Filterjoe's, Panasonic says says 2100 cycles max, optimal everything. The charger may be as important as the battery. I may have to replace my LaCrosse with an Opus

https://www.filterjoe.com/2017/08/19/best-aa-rechargeable-batteries-and-chargers-2018-update/


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Re: Eneloop battery life? [Re: Klutch9] #4966861 01/01/19 12:11 PM
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Quattro Pete Offline
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Yup, no time limit. It's mainly charge cycles.

Just use a good charger and don't over discharge - over discharge is actually more harmful than over charge.


2002 530i   2015 Q5 3.0T   2018 Charger SRT
Re: Eneloop battery life? [Re: Klutch9] #4966863 01/01/19 12:14 PM
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Warstud Offline
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It's hard to put a life on a battery. They do put a shelf life on some but for batterys in use it will vary because of different circumstances. You can read up on them here >>>>> https://batteryuniversity.com/

Re: Eneloop battery life? [Re: Klutch9] #4966892 01/01/19 12:49 PM
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Originally Posted by Klutch9
Just bought some standard AA 2000 mAh Panasonic Eneloops for my Xbox controller, since it eats the alkalines in less than a week. I got the Eneloop brand because of the proven low self-discharge and number of recharge cycles, but how long are they actually rated to last in years? I can't really find any good data on this; maybe there isn't any. Will they last decades potentially, if they haven't hit the maximum number of charge cycles at that point? I know alkaline chemistry is different, and most of them have a rated life, usually 5-10 years after manufacture date, then they expire. I'm assuming since NiMH batteries are rechargeable, their life is limited by charge cycles (and potentially use), rather than time.


Why don't you update us in a few years?


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Re: Eneloop battery life? [Re: Klutch9] #4966899 01/01/19 12:55 PM
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My oldest Eneloop will be 11 this year. They are great batteries. You'll know when it's done when it won't charge any more or only lasts a short period of time.

Rumor has it that many of the "off brand" batteries (the retailer named ones) made in Japan are Eneloops. Ikea ones are good and cheap and rumored to be Eneloops. IIRC a 4 pack of AA is under $7.

Re: Eneloop battery life? [Re: itguy08] #4966913 01/01/19 01:15 PM
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Quattro Pete Offline
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Originally Posted by itguy08
Rumor has it that many of the "off brand" batteries (the retailer named ones) made in Japan are Eneloops. Ikea ones are good and cheap and rumored to be Eneloops. IIRC a 4 pack of AA is under $7.

Here is a list of all possible Eneloop rewraps:
https://eneloop101.com/batteries/rewrapped-batteries/


2002 530i   2015 Q5 3.0T   2018 Charger SRT
Re: Eneloop battery life? [Re: Klutch9] #4967002 01/01/19 03:03 PM
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Cujet Offline
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I have some that are 10 years old and seem to function like new. Plenty of power, plenty of shelf life when unused.


People who count on their fingers should maintain a discreet silence.
Re: Eneloop battery life? [Re: Klutch9] #4967174 01/01/19 06:13 PM
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1000MPH Offline
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I’m seeing a drop off of up to 10% capacity as early as 100 charging cycles (about 20 cycles per year average). I only discharge to 1.1v/cell and normally charge at .1C up to .5 C max. These are in 4 to 5 cell packs and they are not monitored per cell. Still the only NiMh I will buy these days.

Last edited by 1000MPH; 01/01/19 06:16 PM.

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Re: Eneloop battery life? [Re: Klutch9] #4969113 01/03/19 08:00 PM
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bobdoo Offline
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About half of mine are a good 10 years old.

I *can* state with absolute certainty that if you charge AAA at the AA rate that the AAA's will die a very quick death.

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