NiteNumen
Results 1 to 10 of 10

Thread: eneloops only 2000 maH ?

Hybrid View

  1. #1

    Default eneloops only 2000 maH ?

    Why is that?

    I prefer eneloops because regular NiMH cells are typically dead in about 3 months. Eneloops seem to last much longer and have low discharge rates. However, it appears they only come in 2000 maH. I would like longer run times for my bike helmet.

  2. #2
    Flashaholic warlord's Avatar
    Join Date
    Feb 2008
    Location
    Northern Illinois
    Posts
    362

    Default Re: eneloops only 2000 maH ?

    How often are you draining/recharging your bike helmet batteries? If you're doing it every 1-2 weeks eneloops may be wasted in that application. You'd be fine going with a regular NiMH with a high capacity.

    If you're leaving them in your helmet for long perods of time not being used then LSD cells would make sense.

    Quote Originally Posted by youngster View Post
    Why is that?

    I prefer eneloops because regular NiMH cells are typically dead in about 3 months. Eneloops seem to last much longer and have low discharge rates. However, it appears they only come in 2000 maH. I would like longer run times for my bike helmet.

  3. #3
    *Flashaholic* Gunner12's Avatar
    Join Date
    Dec 2006
    Location
    MA
    Posts
    10,043

    Default Re: eneloops only 2000 maH ?

    I think it is the things they added to make it hold a charge longer that is making it have less capacity. But that's only a guess.

  4. #4
    Flashaholic* Black Rose's Avatar
    Join Date
    Mar 2008
    Location
    Ottawa, ON, Canada
    Posts
    4,622

    Default Re: eneloops only 2000 maH ?

    Quote Originally Posted by youngster View Post
    Why is that?

    I prefer eneloops because regular NiMH cells are typically dead in about 3 months. Eneloops seem to last much longer and have low discharge rates. However, it appears they only come in 2000 maH. I would like longer run times for my bike helmet.
    Eneloops have a higher operating voltage, so even though they are "only" 2000 mAh batteries, they have similar performance to 2500mAh batteries.

    http://www.eneloop.ca/eneloop_en_why.html#higher

  5. #5

    Default Re: eneloops only 2000 maH ?

    Quote Originally Posted by Black Rose View Post
    Eneloops have a higher operating voltage
    Higher than what? NiMh and Eneloop are both 1.2v. Eneloops only seem to be an advantage after the storage time when self discharge of NiMh lowers its capacity to below 2000mah. This article suggests that time is about 30 days of storage.

    http://www.stefanv.com/electronics/sanyo_eneloop.html
    Last edited by Nightray; 05-18-2008 at 11:41 AM.

  6. #6
    Flashaholic* Fallingwater's Avatar
    Join Date
    Jul 2005
    Location
    Trieste, Italy
    Posts
    3,311

    Default Re: eneloops only 2000 maH ?

    I *think* he means they sag less under load.
    Eat, drink and be merry, for tomorrow you may die.

  7. #7
    Flashaholic* Yoda4561's Avatar
    Join Date
    Jan 2007
    Location
    Florida, U.S.A.
    Posts
    1,246

    Default Re: eneloops only 2000 maH ?

    that whole 1.2 1.5 volt thing is really misunderstood. A "1.2v" rechargeable often has a higher voltage than a 1.5v alkaline when used in a device that draws more power than a wall clock. Edit: eneloops are also pretty high up on the list for extreme high current drain devices like maglight hotwires. They'll sag less under that sort of load than most other nimhs and alkalines aren't even a contender. The price for that is a 2000 mAH capacity. Squeezing more out of the battery will result in the whole energizer 2500 fiasco where batteries would fail quickly and discharge themselves within a week or less. I've heard the new 2700 batteries are much better in that regard but I'll take an eneloop any day.
    Last edited by Yoda4561; 05-18-2008 at 02:52 PM.

  8. #8
    *Flashaholic* Marduke's Avatar
    Join Date
    Jun 2007
    Location
    Huntsville, AL
    Posts
    10,117

    Default Re: eneloops only 2000 maH ?

    Quote Originally Posted by Nightray View Post
    Higher than what? NiMh and Eneloop are both 1.2v. Eneloops only seem to be an advantage after the storage time when self discharge of NiMh lowers its capacity to below 2000mah. This article suggests that time is about 30 days of storage.

    http://www.stefanv.com/electronics/sanyo_eneloop.html
    NiMH cells in general have a higher voltage than 1.2v throughout their discharge, where alkaline is almost always much lower than 1.5v.

    And Eneloop's maintain a particularly higher voltage due to their lower internal resistance, making them exceptional for high drain devices. They have also proven to be quite robust, more so than most other brands.

  9. #9

    Default Re: eneloops only 2000 maH ?

    Quote Originally Posted by Black Rose View Post
    Eneloops have a higher operating voltage, so even though they are "only" 2000 mAh batteries, they have similar performance to 2500mAh batteries.
    This statement might stem from a very enthusiastic sales departement. For data check out this CPF threat:
    http://www.candlepowerforums.com/vb/...ad.php?t=79302
    Look at the 'Watthours', which corresponds to the actual amount of energy (= Joule = work) that you can get out of a battery. There the eneloops do compare very well with other similar rated NiMH.

  10. #10
    Flashaholic*
    Join Date
    May 2006
    Location
    Toronto, Ontario. CAN.
    Posts
    2,142

    Default Re: eneloops only 2000 maH ?

    The beauty of Eneloops is where need to longer storage, higher operating voltage and where it works for me is above 2A draw. At 8A it's able deliver still ~1.2v and over 1.5WH. Again they are also very very robust in taking abuse.

    I've killed many many Hi-cap cells in ~2C draws over a short period of time. It's true the 2700s hold up better but they aren't immune to FSD.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •