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01-27-2014, 04:09 PM - 2 Likes   #1
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Eneloop Long Term Capacity report 2+ years

Previously I did this with a set of Duracell Pre-Charged - re-badged eneloops (white top - made in Japan).

eneloop (Duracell Pre-Charged) long term report (2+ years)

This time a set of actual eneloops - 1st gen bought as part of the Costco eneloop powerpack.

I had marked them as #s 1-4 - so they were the very first I had ever used - the embossed date code was 06-10SM -
means they were manufactured Oct/2006 (please see: How to read Eneloop date code)



As in the previous report these were kept in my now seldom used Pentax K100D since the previous report on the Duracell Pre-Charged -
so at least since Dec/12/2011 - therefore just over 25 months.

I took a few shots with the eneloops to make sure they were still alive and could power the K100D - which they did -
then I discharge them in the Maha/PowerEX C-9000 at the standard 20% discharge rate = 400mA
and using 2000mAh as the capacity for the % remaining capacities

The results were:

#1 1243mAh (62%)
#2 1273mAh (64%)
#3 1229mAh (61%)
#4 1198mAh (60%)

There has to be a small/low drain of the batteries to keep date/time.

Hope that was of some interest.

01-27-2014, 04:34 PM   #2
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Thanks for the test.
I am curious if the capacity would bounce back, after couple charge-discharge cycles.
01-27-2014, 04:42 PM   #3
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QuoteOriginally posted by Ex Finn. Quote
Thanks for the test.
I am curious if the capacity would bounce back, after couple charge-discharge cycles.
Just to be clear - those were the remaining capacities after sitting for over 25 months idle in the Pentax K100D (with low drain to keep clock running)

I am charging them now - and will report back after about 2 hours for what the Maha/PowerEx C9000 claims to have charged.

Then after >1hour rest - a longer period for a discharge cycle to see what the capacities from full would be.
01-27-2014, 04:49 PM   #4
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QuoteOriginally posted by UnknownVT Quote
Just to be clear - those were the remaining capacities after sitting for over 25 months idle in the Pentax K100D (with low drain to keep clock running)

I am charging them now - and will report back after about 2 hours for what the Maha/PowerEx C9000 claims to have charged.

Then after >1hour rest - a longer period for a discharge cycle to see what the capacities from full would be.
I understand. Those initial numbers are impressive, to say the least.
I can not think of any other battery still being alive, after such long time, except for the Li-Fe Energizer.

01-27-2014, 04:54 PM   #5
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Thanks VT, yes I am interested.
I still use the AA in the Pentax ist ds(4) and the Pentax AF360fgz(4) and the Pentax AF500ftz(4) and in the small old Pentax flashes(2 ea).
I have been using Ray-o-Vacs and the sets are about 4 years old, with success so far. The ist ds goes 6 months and only gets recharged occasionally.

But the AF500ftz is showing a problem :
Normally for a few shots the flash works correctly, so the problem does not show.
But in 2 cases it hangs up:
case 1: sometimes after a full manual 1/1 flash , the thing continues to display, but won't recharge and the ready light is off.
case 2: (in slave mode where I use it most) if it has been on for about 10 minutes, it hangs up with the display on and the ready light is off.
After about 30 minutes the flash then works again, only to repeat the above problem.

In these cases the Ray-o-vacs show 1.37 to 1.47 volt at no load, and will work for long thereafter in the other AF360fgz flash.
At this time I am not sure if the flash is faulty or if the batteries are old with increasing transient impedance, I suppose the easiest is to try a new set first.
01-27-2014, 06:44 PM   #6
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QuoteOriginally posted by UnknownVT Quote
I am charging them now - and will report back after about 2 hours for what the Maha/PowerEx C9000 claims to have charged.
Then after >1hour rest - a longer period for a discharge cycle to see what the capacities from full would be.
OK the charger just said "Done" -
these are the readings of the charge -

#1 1658mAh (110mins)
#2 1755mAh (116mins)
#3 1713mAh (114mins)
#4 1658mAh (110mins)

The batteries are now in the 2hour top-up phase to reach the "100%" -
after at least 1hour rest I'll put them on 0.2C discharge overnight
and see the capacities from "full" in the morning.

I should mention this set of eneloops have had quite regular and extensive usage in dSLRs Pentax K100D and mostly the K-x -
and have had minimum of 16x full to empty cycles (I always allow the the camera to shutdown - then discharge the batteries at 0.2C before charging again)
01-27-2014, 06:55 PM   #7
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QuoteOriginally posted by wombat2go Quote
I still use the AA in the Pentax ist ds(4) and the Pentax AF360fgz(4) and the Pentax AF500ftz(4) and in the small old Pentax flashes(2 ea).
I have been using Ray-o-Vacs and the sets are about 4 years old, with success so far. The ist ds goes 6 months and only gets recharged occasionally.

But the AF500ftz is showing a problem :
Normally for a few shots the flash works correctly, so the problem does not show.
But in 2 cases it hangs up:
case 1: sometimes after a full manual 1/1 flash , the thing continues to display, but won't recharge and the ready light is off.
case 2: (in slave mode where I use it most) if it has been on for about 10 minutes, it hangs up with the display on and the ready light is off.
After about 30 minutes the flash then works again, only to repeat the above problem.

In these cases the Ray-o-vacs show 1.37 to 1.47 volt at no load, and will work for long thereafter in the other AF360fgz flash.
At this time I am not sure if the flash is faulty or if the batteries are old with increasing transient impedance, I suppose the easiest is to try a new set first.
RayOVacs at one time were spoken in the same breath as eneloops - but I note they are no longer available as originally -
RayOVac seems to have gone through several iterations with their LSDs and I've been somewhat confused by their offerings.

Not to take anything away from any other brand -
it seems to me not all LSDs are created equal
and over the test of time eneloops do appear to be superior -
it might be marginal when they are new - but over the long term
the marginal difference start to become really significant.

The problem with older batteries is that they have had lots of opportunities to become damaged -
like any over-heat, over-charge, over-discharge or even simply being dropped, or shocked -
and it only take one cell to bring a whole set down -
just as it would only take one cell to have been just slightly sub-par -
to have the whole set show their age.

4 years is good service - think of the amount you would have spent if you had used disposable batteries.

and the latest eneloops are spec'd for 1800 cycles -
that's huge - even if used and charged every day without a break - 365 -
that would be almost 5 years' usage......


Last edited by UnknownVT; 01-27-2014 at 08:20 PM.
01-28-2014, 03:36 AM   #8
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I am also still using same eneloops i did buy for k100d, about 7 years ago. Ididtest them few weeks ago and they all still have capasity 1860-1960mhA. One did give only 1600 but after few charge-decharge cycle its 1800+. I alsouse maha C9000 charger now, its great charger. Batts not heat much enemore.

Breakin new enelloops i get around 1950mhA. XX serie was 2600+
01-28-2014, 10:13 AM   #9
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Although 16+ cycles of full to empty (camera shutdown) may seem low - these were pretty regular, frequent and demanding.

Pentax dSLRs that use AA batteries are notorious for being very battery fussy -
they use voltage level threshold to determine the level and the shutdown.

I had also used the Kodak Pre-Charged (suspected re-badge of the GP ReCyko)
which I consider the "next best" LSD (along with the Immedions)
The Kodaks just do NOT maintain their voltage levels as well as eneloops - please see this long thread:
eneloop vs. Kodak Pre-Charged Voltage Maintenance
Summary of results in Post #57 (link)

I normally rotate through 3 sets of eneloops and DuraLoops (Duracell Pre-Charged - white top made in Japan - re-badged eneloops)
and average over 1,100 shots per charge - that means this one set of eneloops had over 17,600 shots under its belt.
before being kept in the seldom used Pentax K100D to keep the clock running and more to the point all my settings and be ready to use if called for.

I had run through the standard discharge at 0.2C overnight, these were the readings -

#1 1777mAh (283mins)
#2 1737mAh (288mins)
#3 1690mAh (279mins)
#4 1623mAh (269mins)
01-28-2014, 11:38 AM   #10
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QuoteOriginally posted by UnknownVT Quote
charger just said "Done" -
these are the readings of the charge -

#1 1658mAh (110mins)
#2 1755mAh (116mins)
#3 1713mAh (114mins)
#4 1658mAh (110mins)
QuoteOriginally posted by UnknownVT Quote
standard discharge at 0.2C overnight, these were the readings -

#1 1777mAh (283mins)
#2 1737mAh (288mins)
#3 1690mAh (279mins)
#4 1623mAh (269mins)
After an over 4 hours rest I put these back on charge again at 0.5C - readings when the charger said "Done" -

#1 1688mAh (112mins)
#2 1687mAh (112mins)
#3 1686mAh (112mins)
#4 1612mAh (107mins)

Batteries are now in the 2hour top-up charge to reach "100%"
01-28-2014, 05:20 PM   #11
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QuoteOriginally posted by UnknownVT Quote
After an over 4 hours rest I put these back on charge again at 0.5C - readings when the charger said "Done" -

#1 1688mAh (112mins)
#2 1687mAh (112mins)
#3 1686mAh (112mins)
#4 1612mAh (107mins)

Batteries are now in the 2hour top-up charge to reach "100%"
That #4 is lacking, time to retire it
02-03-2014, 11:53 AM   #12
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Thanks for the long-term report. I was just thinking about the Eneloop batteries today and was wondering how the do in the long term.


Steve
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