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Old 12th of April 2009 (Sun)   #1
SYS
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Default 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

PURPOSE:

When my 4th Grade son had the opportunity to work on his elementary school’s annual Science Fair recently, the idea of doing this test came about. I made some revisions to his final report to suit the POTN forum’s purposes, but still some words of caution that we didn’t set out to do an exhaustive or the most comprehensive and meticulous scientific project on battery tests. In other words, use our report here as just a rough guideline for making your own decisions.

We photographers rely heavily on “AA” batteries for many of our lighting gear, particularly our hot shoe flashes, external battery packs, and other accessories, and we often prefer those rechargeable NiMH kinds over disposable alkalines for economical and environmental reasons. Yet, these NiMH rechargeables can be quite confusing – and very often frustrating! – with all different kinds that are being sold in the market today with all varying degrees of performance satisfaction. For one thing, there are just too many brands with different “mAh” (Milliamp-Hour) ratings with different prices. There are fast recharging “15-Minute” kinds, “Low Self-Discharge” (even “Ultra Ultra Low Self-Discharge”!) kinds, “Ready to Use” kinds, “Hybrid” kinds, and so on. And as the newer battery manufacturing technologies grow, we’ll be seeing more unfamiliar kinds grow, as well, I’m sure.

So, which one to get?



Is there just one kind and one brand that would rise to the top as the “BEST” of them all? Is there such a thing? That’s what we wanted to know, and what I want to share here.

METHODOLOGY:

We decided to purchase those rechargeable “AA” batteries that were most popularly mentioned here and elsewhere (9 different kinds in all from various stores), but we also decided to throw into the mix one alkaline battery kind (Energizer Max) as a referential interest.

All tests were conducted in the ambient indoor temperature fluctuating between 63F to 72F.

The tests were conducted in the following five key usage points of interests:

1) “Ready to Use” right out of new package. How true and reliable are those brands that claim that their batteries are ready to be used right away?

2) “Shelf Life” for testing the rate of self-discharge. All batteries were fully charged prior to conducting the test (with the exception of Energizer alkaline).

3) “Camera Flash Pops” – we tallied 6,560 pops after all was done! We decided to employ the Canon Speedlite 300EZ from my old film photography days as an ideal for such flash “abuse” as opposed to using my 580EX. Although the 580EX would have been perhaps more useful for those who do own the same flash, you can compare the difference in the output level by consulting the following as a reference:

Guide Number (at ISO 100):
Zoom Position (mm): at 35

Canon Speedlite 300EZ: Normal Flash = 25 (83)
Canon Speedlite 580EX: Normal Flash = 36 (118.1)

The flash was popped only when the capacitor was full, indicated by the pilot light being “red.” The flash was given 5 minutes to cool after a series of 20 pops. Each set of 4 “AA” batteries were tested using the ZTS Pulse Load Multi-Battery Tester after each 100th pops until the 500th pops or when the recycle time took too long to be of significance. In order to be accurate the percentage power remaining was only recorded when the ZTS Tester gave the consistent reading three times on each battery. Since not all 4 batteries in a given set read the same power remaining, the power average was calculated by adding the remaining power divided by 4.

4) “Camera Flash Recycle Time” – Used the same method of popping as the above. A stopwatch was used at the first five pops and the average recycle time was recorded. The “start” point was at the moment the flash fired and the “stop” point was when the pilot light turned red. After the initial time was read, the recycle time was read at each 100th juncture with the average recycle time read at the last 5 pops of each juncture, for example, 95th-100th, 195th-200th, 295th-300th, and so on.

5) “Flashlight” – in addition to the higher current, Canon flash popping test, this lower current test was conducted, as well. A set of two fully charged batteries were placed in a common household flashlight with the power switch turned on. They were pulled out of the flashlight and tested after the initial two hours. Thereafter, they were tested each hour for the power remaining until they were completely drained.

6) “The Best ‘Low Self-Discharge’ VS. the Best ‘Performing’ Battery” – After all the tests were done, we had a rather obvious confirmation of our hypothesis that there is no one “BEST” battery that is the clearest winner in all categories. However, there were clear winners in different categories. So we decided to test the winner in the 1) “Ready to Use” and 2) “Shelf Life” (low self-discharge indicators) tests combined with the winner in the 3) “Camera Flash Pops,” 4) “Flash Recycle Time,” and 5) “Flashlight” (performance indicators) tests.

We placed these two winners in a head-to-head duel with the “Camera Flash Pops” test (using the same methodology) ONE week after being fully charged, and another sets of these winners THREE weeks after being fully charged. Why one to three weeks period? That’s because most of us photographers use the rechargeable batteries within that time period after a full charge. We wanted to find out the time it takes for the higher self-discharging battery to lose its power below that of the low self-discharging battery. We of course knew that the lower self-discharging battery will beat the higher self-discharging battery – sooner or later. The question is how long, particularly within the three weeks time period? We could have done in one, two, and in three weeks period, but we felt that the tests done in two separate occasions were enough.
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Last edited by SYS : 13th of April 2009 (Mon) at 13:58.
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Old 12th of April 2009 (Sun)   #2
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

MATERIAL:

La Crosse Technology BC-900 Battery Charger
ZTS Pulse Load Multi-Battery Tester (“The Mini-MBT computes the battery's actual remaining power capacity using a 2-second pulse load test. This pulse load simulates the real power demand that batteries experience in a high drain electronic device. So battery performance is measured, not just voltage.”-- from product description)
Canon Speedlite 300EZ Flash
“AA” Household Flashlight
• Stopwatch


“AA” Rechargeable NiMH Batteries (and One Alkaline) Tested:

1) Sanyo eneloop “Pre-Charged” – 2000mAh (8 from Amazon.com, 8 from ThomasDistributing.com)
2) MAHA Powerex2700mAh (8 from ThomasDistributing.com)
3) MAHA Powerex Imedion “Pre-Charged” – 2100mAh (8 from ThomasDistributing.com)
4) Rayovac Hybrid “Pre-Charged” – 2000mAh (4 from Super Target)
5) Rayovac “15-Minute” Rechargeable – 2000mAh (4 from Sam’s Club)
6) Duracell DX1500 Rechargeable “Pre-Charged” – 2000mAh (8 from Target)
7) Kodak Rechargeable “Pre-Charged” – 2100mAh (4 from WalMart)
8 ) Energizer Rechargeable – 2500mAh (8 from Sam’s Club)
9) La Crosse Rechargeable – 2600mAh (4 came with the charger, from Amazon.com)
10) Energizer Max Alkaline – “Use by 2013” (24 from Sam’s Club, included here for power comparison reference point test)







LIMITATIONS:

On “Ready to Use” Test: one obvious limitation here is the lack of information as to how long the “new” packages have been sitting around in the warehouses and on store shelves and under what ambient temperatures prior to the tests. Unfortunately, the packages didn’t come with the manufacturing dates.

On “Shelf Life” Test: one immediate limitation felt was the time duration in which to conduct the test. We only had one month time period to our disposal when such test ideally requires more than a full year. Most new NiMH batteries would retain their full or near full capacity for the entire three weeks after a charge, making our “Shelf Life” test rather irrelevant. Nevertheless, we felt it useful to include it in the final report for two reasons: 1) some batteries tested failed to retain full capacity even within the short duration; 2) we felt it useful when combined with the “Ready to Use” test results.

We didn’t have the time necessary to go through several “break-in” cycles of “refreshing” or “conditioning” of the new batteries tested. Would it have made any difference if we had, particularly for those brands that are not ready to be used right out of the package and with no claim of “No Memory Effect”? We don’t know, but one thing for sure is that all were tested under the same conditions and fairness.
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Last edited by SYS : 22nd of April 2009 (Wed) at 08:15.
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Old 12th of April 2009 (Sun)   #3
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

TEST #1:

READY-TO-USE” RIGHT OUT OF NEW PACKAGE


NOTE: All batteries tested had the claim of “Ready to Use” and “Low Self-Discharge” with the exception of Powerex 2700mAh (not to be confused with the Powerex “Imedion” 2100mAh). Both the Powerex 2700mAh and the Energizer Alkaline were thrown into this mix only as referential interests.

All tests results are shown in the performance ranking order from the best to the worst.

#1

eneloop – 2000mAh (from Amazon.com)

16 @ 100%

#2

Energizer Max Alkaline – “Use By 2013” (from Sam’s Club)

7 @ 100% and 1 @ 80%

#3T

MAHA Powerex Imedion “Pre-Charged” – 2100mAh (from ThomasDistribution.com)

8 @ 80%

#3T

Duracell Rechargeable "Pre-Charged" – 2000mAh (from Target)

8 @ 80%

#5

Rayovac Hybrid "Pre-Charged" – 2000mAh (from Super Target)

3 @ 80% and 1 @ 60%

#6

Kodak “Pre-Charged” – 2100mAh (from WalMart)

2 @ 80% and 2 @ 60%

#7

PowerEx – 2700mAh (from ThomasDistribution.com)

4 @ 40% when freshly opened and tested on March 16, 2009
(Of these four, 2 @ 40%, 2 @ 20% on March 19, 2009)
3 @ < 20%
1 @ totally drained
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Last edited by SYS : 13th of May 2009 (Wed) at 17:48.
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Old 12th of April 2009 (Sun)   #4
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

TEST #2:

SHELF LIFE” (AFTER THREE WEEKS)


NOTE: See the “Limitations” remarks above regarding the “Shelf Life” test.

#1T

8 eneloop – 2000mAh
After 3 weeks: @ 100%

#1T

4 Rayovac Rechargeable Hybrid – 2000mAh
After 3 weeks: 4 @ 100%

#1T

4 Duracell Rechargeable – 2000mAh
After 3 weeks: 4 @ 100%

#1T

4 Energizer Max Alkaline (“Use By 2013”)
After 3 weeks: 4 @ 100%

#1T

4 Powerex – 2700mAh
After 3 weeks: 4 @ 100%

#6

4 La Crosse – 2600mAh
After 3 weeks: 2 @ 100%, 2 @ 80%

#7

4 Rayovac 15 Minute Rechargeable – 2000mAh
After 3 weeks: 1 @ 100% and 3 @ 80%

#8

8 Energizer Rechargeable – 2500mAh
After 3 Weeks: 2 @ 80%, 1 @ 20%, 1 @ < 20%
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Last edited by SYS : 12th of April 2009 (Sun) at 20:56.
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Old 12th of April 2009 (Sun)   #5
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

TEST #3:

CAMERA FLASH POPS


NOTE: The performance ranking was determined by the combined factors of: 1) number of flash pops, 2) % power remaining, and 3) faster recycle time, for the necessary tie-break situations.

#1

4 Powerex – 2700mAh

After 100 pops: 4 @ 100%
After 200 pops: 1 @ 100% and 3 @ 80%
After 300 pops: 4 @ 80%
After 400 pops: 1 @ 80% and 3 @ 60%
After 500 pops: 4 @ 40%

#2

4 La Crosse – 2600mAh

After 100 pops: 4 @ 80%
After 200 pops: 4 @ 80%
After 300 pops: 2 @ 80% and 2 @ 60%
After 400 pops: 4 @ 60%
After 500 pops: 4 @ 40%

#3

4 Energizer Rechargeable -- 2500mAh

After 100 pops: 3 @ 80% and 1 @ 60%
After 200 pops: 2 @ 80% and 2 @ 60%
After 300 pops: 2 @ 60% and 2 @ 40%
After 400 pops: 2 @ 60% and 2 @ 40%
After 500 pops: 2 @ 60% and 2 @ 20%

#4

4 MAHA Powerex Imedion – 2100mAh

After 100 pops: 2 @ 80%, 2 @ 60%
After 200 pops: 4 @ 60%
After 300 pops: 4 @ 60%
After 400 pops: 2 @ 60%, 1 @ 40%, 1 @ 20%
After 500 pops: 2 @ 20%, 2 @ < 20%

#5

4 Rayovac Rechargeable Hybrid – 2000mAh

After 100 pops: 4 @ 80%
After 200 pops: 4 @ 60%
After 300 pops: 4 @ 60%
After 400 pops: 4 @ 40%
After 500 pops: 4 @ 20%

#6

4 Kodak – 2100mAh

After 100 pops: 4 @ 60%
After 200 pops: 4 @ 60%
After 300 pops: 3 @ 60%, 1 @ 40%
After 400 pops: 4 @ 40%
After 480 pops: 4 @ 20%

#7

4 Duracell Rechargeable – 2000mAh

After 100 pops: 4 @ 80%
After 200 pops: 4 @ 60%
After 300 pops: 4 @ 60%
After 400 pops: 4 @ 60%
After 480 pops: 3 @ 20% and 1 @ < 20%

#8

4 eneloop -- 2000mAh

After 100 pops: 3 @ 100% and 1 @ 80%
After 200 pops: 4 @ 80%
After 300 pops: 1 @ 80% and 3 @ 60%
After 400 pops: 4 @ 40%
After 450 pops: 4 @ < 20%

#9

4 Rayovac “15 Minute” Rechargeable – 2000mAh

After 100 pops: 4 @ 80%
After 200 pops: 4 @ 60%
After 300 pops: 4 @ 40%
After 400 pops: 2 @ 40% and 2 @ 20%
After 430 pops: 4 @ < 20%

#10

4 Energizer Max Alkaline (“Use By 2013”)

After 100 pops: 3 @ 60% and 1 @ 40%
After 200 pops: 4 @ 40%
After 300 pops: 3 @ 40% and 1 @ 20%
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Last edited by SYS : 18th of April 2009 (Sat) at 10:13.
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Old 12th of April 2009 (Sun)   #6
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

TEST #4:

CAMERA FLASH RECYCLE TIME


NOTE: The performance ranking was determined by the combined factors of: 1) faster recycle time, 2) number of flash pops, and 3) % power remaining. The flash popping did not continue when the recycle time took too long to be of any significance even if power still remained.

#1

4 Powerex – 2700mAh

1st 5 Pops Average Recycle Time: (3:86sec)
After 100 pops: (4:61sec)
After 200 pops: (4:88sec)
After 300 pops: (5:10sec)
After 400 pops: (5:48sec)
After 500 pops: (7:16sec)

#2

4 La Crosse – 2600mAh

1st 5 Pops Average Recycle Time: (3:84sec)
After 100 pops: (5:10sec)
After 200 pops: (5:17sec)
After 300 pops: (5:51sec)
After 400 pops: (6:14sec)
After 500 pops: (7:96sec)

#3

4 Energizer Rechargeable - 2500mAh

1st 5 Pops Average Recycle Time: (4:05sec)
After 100 pops: (5:50sec)
After 200 pops: (5:82sec)
After 300 pops: (6:54sec)
After 400 pops: (7:30sec)
After 500 pops: (8:68sec)

#4

4 MAHA Powerex Imedion – 2100mAh

1st 5 Pops Average Recycle Time: (3:84sec)
After 100 pops: (5:51sec)
After 200 pops: (5:58sec)
After 300 pops: (5:61sec)
After 400 pops: (6:14sec)
After 500 pops: (16:83sec)

#5

4 Rayovac Rechargeable Hybrid – 2000mAh

1st 5 Pops Average Recycle Time: (3:84sec)
After 100 pops: (5:37sec)
After 200 pops: (5:58sec)
After 300 pops: (6:07sec)
After 400 pops: (7:12sec)
After 500 pops: (19:49sec)

#6

4 Kodak – 2100mAh

1st 5 Pops Average Recycle Time: (3:98sec)
After 100 pops: (6:14sec)
After 200 pops: (5:93sec)
After 300 pops: (6:42sec)
After 400 pops: (7:19sec)
After 480 pops: (24:24sec)

#7

4 Duracell Rechargeable – 2000mAh

1st 5 Pop on Average Recycle Time: (3.68sec)
After 100 pops: (5:05sec)
After 200 pops: (5:48sec)
After 300 pops: (5:81sec)
After 400 pops: (6:80sec)
After 480 pops: (1min 44sec)

#8

4 eneloop – 2000mAh

1st 5 Pops Average Recycle Time: (3.37sec)
After 100 pops: (4:63sec)
After 200 pops: (5:37sec)
After 300 pops: (5:41sec)
After 400 pops: (7:63sec)
After 450 pops: (18:01sec)
After 460 pops: (35:41sec)

#9

4 Rayovac “15 Minute” Rechargeable – 2000mAh

1st 5 Pops Average Recycle Time: (3:72sec)
After 100 pops: (5:35sec)
After 200 pops: (5:98sec)
After 300 pops: (7:35sec)
After 400 pops: (10:82sec)
After 430 pops: (41:82sec)

#10

4 Energizer Max Alkaline (Use By 2013)

1st 5 Pop on Average Recycle Time: (4.68sec)
After 100 pops: (12.4sec)
After 200 pops: (16:00sec)
After 300 pops: (30sec)
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Last edited by SYS : 18th of April 2009 (Sat) at 10:13.
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Old 12th of April 2009 (Sun)   #7
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

TEST #5:

FLASHLIGHT TEST


NOTE: The performance ranking is determined by % of power remaining and time took to drain completely for the necessary tie-break situations.

#1

2 Powerex – 2700mAh

After 2nd hour: 2 @ 100%
After 3rd hour: 2 @ 80%
After 4th hour: 2 @ 60%
After 5th hour: 2 @ 20%
After 5th hour and 41 minutes: Completely drained

#2

2 Energizer Rechargeable

After 2nd hour: 1 @ 80% and 1 @ 60%
After 3rd hour: 1 @ 60% and 1 @ 40%
After 4th hour: 1 @ 60% and 1 @ 40%
After 5th hour: 2 @ < 20%
After 5th hour and 10 minutes: Completely drained

#3

2 MAHA Powerex Imedion – 2100mAh

After 2nd hour: 2 @ 80%
After 3rd hour: 2 @ 60%
After 4th hour: 1 @ 60%, 1 @ 40%
After 5th hour: 2 @ < 20%
After 5th hour and 2 minutes: Completely drained

#4

2 Rayovac Rechargeable Hybrid – 2000mAh

After 2nd hour: 2 @ 80%
After 3rd hour: 2 @ 60%
After 4th hour: 2 @ 40%
After 4th hour and 50 minutes: completely drained

#5

2 La Crosse Rechargeable – 2600mAh

After 2nd hour: 2 @ 60%
After 3rd hour: 2 @ 60%
After 4th hour: 2 @ 40%
After 4th hour and 30 minutes: completely drained

#6

2 eneloop – 2000mAh

After 2nd hour: 2 @ 80%
After 3rd hour: 2 @ 80%
After 4th hour: 2 @ 40%
After 4th hour and 20 minutes: Completely drained

#7

2 Duracell Rechargeable – 2000mAh

After 2nd hour: 2 @ 80%
After 3rd hour: 2 @ 60%
After 4th hour: 2 @ < 20%
After 4th hour and 8 minutes: Completely drained

#8

2 Energizer Max Alkaline (Use by 2013)

After 2nd hour: 2 @ 40%
After 3rd hour: 2 @ 20%
After 4th hour: 1 @ 20%, 1 @ < 20%
After 4th hour and 8 minutes: Completely drained

#9

2 Kodak Rechargeable – 2100mAh

After 2nd hour: 2 @ 60%
After 3rd hour: 2 @ 60%
After 4th hour: 2 @ < 20%
After 4th hour and 05 minutes: Completely drained

#10

2 Rayovac "15 Minute" Rechargeable – 2000mAh

After 2nd hour: 1 @ 80% and 1 @ 60%
After 3rd hour: 2 @ 20%
After 3rd hour and 20 minutes: Completely drained
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Last edited by SYS : 12th of April 2009 (Sun) at 20:55.
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Old 12th of April 2009 (Sun)   #8
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

TEST #6:

THE BEST ‘LOW SELF-DISCHARGE’ VS. THE BEST ‘PERFORMING’ BATTERY


NOTE: The "Best Low Self-Discharge Battery" was determined by the combined results of the 1) “Ready to Use” and 2) “Shelf Life” (low self-discharge indicators) tests. The "Best Performing Battery" was determined by the combined results of the 3) “Camera Flash Pops,” 4) “Flash Recycle Time,” and 5) “Flashlight” (performance indicators) tests.


ENELOOP VS. POWEREX


ONE WEEK AFTER FULL CHARGE:

4 Sanyo eneloop – 2000mAh:

1st 5 Pop on Average Recycle Time: 4 @ 100% (4:05sec)
After 100 pops: 4 @ 80% (4:75sec)
After 200 pops: 4 @ 80% (4:89sec)
After 300 pops: 3 @ 80%, 1 @ 60% (5:24sec)
After 400 pops: 4 @ 60% (6:28sec)
After 450 pops: 4 @ 20% (13:12sec)
After 460 pops: 4 @ 20% (39:10sec)

4 MAHA Powerex – 2700mAh:

1st 5 Pop on Average Recycle Time: 4 @ 100% (4:12sec)
After 100 pops: 4 @ 80% (4:82sec)
After 200 pops: 4 @ 80% (4:96sec)
After 300 pops: 4 @ 80% (5:03sec)
After 400 pops: 4 @ 60% (5:69sec)
After 500 pops: 4 @ 40% (7:48sec)


THREE WEEKS AFTER FULL CHARGE:

4 Sanyo eneloop – 2000mAh:

1st 5 Pop on Average Recycle Time: 4 @ 100% (4.43sec)
After 100 pops: 4 @ 80% (4:93sec)
After 200 pops: 4 @ 80% (4:96sec)
After 300 pops: 4 @ 60% (5:58sec)
After 400 pops: 4 @ 40% (7:26sec)
After 450 pops: 4 @ 20% (17:39sec)
After 460 pops: 4 @ 20% (36:39sec)

4 MAHA Powerex – 2700mAh:

1st 5 Pop on Average Recycle Time: 4 @ 100% (4:73sec)
After 100 pops: 4 @ 80% (5:23sec)
After 200 pops: 4 @ 80% (5:35sec)
After 300 pops: 4 @ 80% (5:60sec)
After 400 pops: 4 @ 60% (5:73sec)
After 500 pops: 4 @ 40% (7:40sec)

WINNER IN BOTH TESTS: MAHA POWEREX 2700mAh

NOTE II: ENELOOP VS. IMEDION (POWEREX)

Among all the "low self-discharge" claiming batteries tested, these two in particular deserve some scrutiny. The problem, as already noted in the methodological "Limitations" section above, is that we don't know how long these new battery packages have been sitting around, and under what conditions, in the warehouses and on store shelves prior to being opened and tested. We don't have access to their manufacturing dates. So how do we interpret the test results, such as 16 eneloops (8 from Amazon.com and 8 from ThomasDistribution.com) all registering at 100% capacity upon opening, and 8 Powerex Imedions (from ThomasDistribution.com) all registering at 80% opening? It is possible that 8 Imedions were sitting around the warehouse 6 months or so longer than those 16 eneloops.

But suppose that eneloops are indeed superior to Imedions in the category of "low self-discharge" contest between the two (personally, this is what I "suspect")? After all, other brands with the same "low self-discharge" claims tested -- Duracell DX1500, Rayovac Hybrid, Kodak -- all failed to register at 100% capacity when first opened, like Imedions. Could all of these have been sitting around the warehouse or store shelves for 6 months or so longer than eneloops? Possible, but not likely.

But Imedion, among all "low self-discharge" claiming battery brands, significantly outperforms eneloop by about 50-70 flash pops and some 40 minutes of extra flashlight output. So then which one would you choose, particularly for those applications where "low self-discharge" is really ideal but you certainly wouldn't mind getting the extra power out of it?

CONCLUSION:

Someone said that batteries are like human beings in one respect (other than they all die in the end ): there's no perfect battery. Those disposable alkalines are great for convenience with no maintenance but can't be reused, while rechargeables are reusable and therefore economical but needs the user attention and much love.... Some rechargeables are great for performance but not so hot when unused for awhile, while other rechargeables are great for low self-discharge but wilt after some workout. Etc. Etc.

I see the day coming, though, when we'll at least see the marriage between the ever improving low self-discharge technology of eneloop and the ever evolving high performance technology of Powerex and others. Or perhaps rechargeable "AA" lithium-ion batteries might offer a better alternative. Whatever the future holds for us when it comes to batteries, I hope the present "rough" tests would serve you well in your personal quest for the most suitable batteries for your needs.
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Last edited by SYS : 13th of April 2009 (Mon) at 19:16.
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Old 12th of April 2009 (Sun)   #9
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

HI Soo Young,

Very comprehensive and some very good information. I appreciate that you took the time to conduct these tests.
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Old 12th of April 2009 (Sun)   #10
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

Wow you put a lot of time into this!


Very useful information when shopping for new rechargeables.


This should be stickied, in my opinion.
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Old 12th of April 2009 (Sun)   #11
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

Conclusion?
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Old 12th of April 2009 (Sun)   #12
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

Thanks, Robert and Nick. One month of work, but it was a huge pleasure working with my son on his project...
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Old 12th of April 2009 (Sun)   #13
SYS
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

Quote:
Originally Posted by dshankar View Post
Conclusion?
I thought I'll just have the rankings under each category to speak for themselves. But here's my own...

I was really impressed with MAHA Powerex's performance, especially after being tested three weeks after a full charge (see Test #6 above). I was frankly expecting Sanyon eneloop to beat Powerex at that later stage.

Sanyo eneloop did meet my expectation of its "low self-discharge" claims while other same claiming batteries did not live up to their claims.

Personally, I'd rely heavily on eneloops or Imedions for those "intermittent" or non-continuous applications, whereas I'd go to Powerex 2700mAh (not Imedion) for any intensive applications, such as wedding shoot or such events.
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Last edited by SYS : 16th of December 2009 (Wed) at 14:21.
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Old 12th of April 2009 (Sun)   #14
int2str
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

Great test!

Was the flash set to manual? If so, what power output?
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Old 12th of April 2009 (Sun)   #15
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Default Re: 6,560 FLASH POPS LATER: The Results of "AA" Rechargeable Battery Tests

What did you use to charge them? A higher charge rate will cause them to have a little more "pop" when fully charged and a slower charge rate will cause them to last a little longer?

Also do you have any data on the mah that each of the batteries hold?
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