1 Year LSD shootout: Eneloops, GP ReCyKos and Imedions...it's done!

ChrisGarrett

Flashlight Enthusiast
Joined
Feb 2, 2012
Messages
5,700
Location
Miami, Florida
First off, this isn't a peer reviewable scientific test, so keep that in mind while proceeding.

Obviously, it's a statistically insignificant sample size, but oh well?

Four NEW batteries each of Eneloop Gen 2 2000 mAh (minimum 1900 mAh, date code of 9/2011,) GP ReCyKos 2050 mAh, bought in early 2012 and four of the PowerEx Imedion 2400 mAh (minimum 2250 mAh,) also bought in early 2012.

Eneloops were taken out of the pack, discharged (500mA) on the Maha C9000, charged back up and then discharged in my Klarus P2A, so they essentially had one cycle, or at least, that's how I'm writing it up. The GPs and Imedions were new out of the pack. They were discharged at 500mA and 600mA respectively and then put through the CYCLE function on the Maha.

Charger is the Maha C9000. I didn't perform a break in on these cells but did use the Maha's Cycle function.

Eneloops cycled two times at 500mA charge/300mA discharge.

GP ReCyKos cycled three times at 500mA charge/300mA discharge.

Imedions cycled three times at 600mA charge/300mA discharge.

Final capacity in mAh after cycling, before hibernation:

Eneloops:

1. 1954
2. 1968
3. 1939
4. 1971

Average: 1958

GP ReCyKos:

1. 2038
2. 2059
3. 2039
4. 2063

Average: 2050

Imedions:

1. 2236
2. 2225
3. 2228
4. 2230

Average: 2230

State of charge after cycling, but before hibernation:

Eneloops (3 hrs rest):

1. 1.437v
2. 1.439v
3. 1.437v
4. 1.441v

GP ReCyKos (1:45 hrs rest. I had to leave early, lol.):

1. 1.434v
2. 1.432v
3. 1.430v
4. 1.438v

Imedions (3 hrs rest):

1. 1.427v
2. 1.428v
3. 1.428v
4. 1.430v

1 year hibernation to the day, for the 3 brands.

State of charge after 1 year:

Eneloops (2/28/12-2/28/13):

1. 1.305v
2. 1.305v
3. 1.305v
4. 1.305v

GP ReCyKos (3/1/12-3/1/13):

1. 1.285v
2. 1.286v
3. 1.283v
4. 1.283v

Imedions (3/4/12-3/4/13):

1. 1.271v
2. 1.272v
3. 1.269v
4. 1.270v

Discharged at 100mA, for all cells: "What's in the box?":

Eneloops:

1. 1695 (86.7% left)
2. 1705 (86.6% left)
3. 1692 (87.3% left)
4. 1717 (87.1% left)

Average capacity: 1702 mAh
Average loss after 1 year: 13.08%

GP ReCyKos:

1. 1696 (83.2% left)
2. 1703 (82.7% left)
3. 1674 (82.1% left)
4. 1691 (82.0% left)

Average capacity: 1691 mAh
Average loss after 1 year: 17.5%

Imedions:

1. 1557 (69.6% left)
2. 1593 (71.6% left)
3. 1419 (63.7% left)
4. 1517 (68.0% left)

Average capacity: 1522 mAh
Average loss after 1 year: 31.8%

Numbers rounded up.

Batteries were stored in the dark, in a credenza, in a climate controlled (summer) condo. 75*-80* for the most part.

The numbers speak for themselves.

Thanks for reading, Chris




 
Last edited:

Lurveleven

Flashlight Enthusiast
Joined
Dec 21, 2004
Messages
1,237
Location
Bergen, Norway
Thank you so much for doing this test!
Eneloops will still be my preferred AA/AAA cell, but ReCyKo is also looking really good, so it will be safe to get these in other sizes where Eneloops are not available.
 

LilKevin715

Enlightened
Joined
May 25, 2010
Messages
712
Location
San Diego, CA USA
Thanks for the testing Chris! It looks like the Imedion cells are not in the same league compared to Eneloops in terms of low self discharge characteristics.
 

SilverFox

Silver Moderator
Joined
Jan 19, 2003
Messages
12,449
Location
Bellingham WA
Hello Chris,

That was an excellent test and the results speak for themselves.

Thanks for sharing.

Tom
 

mhanlen

Enlightened
Joined
Jul 14, 2013
Messages
494
Location
Eastern USA
I know this is several months old, but I came across it because of a link in a more recent thread. Thanks for the test! I wish duraloops were put up to this sort of test too. Looks like I'll stick to buying eneloops for long term storage in a few lights.
 

braddy

Enlightened
Joined
Nov 24, 2011
Messages
516
Great information, what are the opinions of how the gen 3 eneloops would be looking?

Any wild guesses or possible numbers?
 
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