Rechargable batteries and information

Discussion in 'UK Photography' started by john hamiliton, Jun 14, 2010.

  1. My pocket sized DAB radio eats AAA size batteries like there is no tomorrow.

    Maplin are selling so called 'Hybrid' rechargable AAA 800 mAh at four for
    £10.99. Whilst Argos are selling four 'ordinary rechargable' AAA 850 mAh at
    £5.99 (and 1000 mAh AAA at £14.99, which seems a big jump in proportional
    price for another 150 mAh ? )

    In this DAB radio situation, would so called *Hybrids* be of any extra
    advantage, considering they are practically twice the price of Argos?

    Grateful for any advice on the latest state of play with these rechargable
    batteries, and any info on where best to buy them from. Thanks.
     
    john hamiliton, Jun 14, 2010
    #1
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  2. john hamiliton

    Guest Guest

    Hybrids are only really useful in devices that have a very low power
    requirement or aren't used for long periods, as they retain charge
    better than conventional NiMH. ISTR Lidl was pretty cheap for no-name
    NiMH last time I looked.
     
    Guest, Jun 14, 2010
    #2
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  3. john hamiliton

    Mr. Benn Guest

    Or even better, 7dayshop.com are usually the cheapest. I buy their own
    brand AAs and AAAs for around £4 for a pack of 4. Watch out for retailers
    selling lower capacity rechargeables.
     
    Mr. Benn, Jun 14, 2010
    #3
  4. john hamiliton

    CD Guest

    Both Lidl & Aldi do them for around £2.79 for 4, I think Lidl also
    have a charger bundle currently too. I have loads of them powering
    various kids toys & the dect phones with no problems. Just buy 2 sets
    for continued listening.
     
    CD, Jun 14, 2010
    #4
  5. john hamiliton

    newshound Guest

    The thing I would strongly recommend is to get one of the slightly more
    expensive chargers which senses and recharges individual cells. I get much
    better life out of sets of (AA) batteries since I changed over to one of
    them.
     
    newshound, Jun 14, 2010
    #5
  6. john hamiliton

    OG Guest

    Hybrids are better than ordinary NiMH batteries because they provide a
    slightly higher voltage for longer. As it's usually the drop off in voltage
    that triggers the 'low battery' warning you may well find that a 850mAh
    hybrid will be significantly better than a 1000mAh ordinary one, at least
    that's what I've found with my digital camera.

    As for where to buy them; Amazon has good prices (4x AAA uniross hybrio for
    <£4 and free P&P )
     
    OG, Jun 14, 2010
    #6
  7. john hamiliton

    Steve Terry Guest

    For the money Lidl's Tronic brand NiMh cells are great, only problem
    is it's anyone's guess when they are in stock.
    My local lidl's have been out of stock of them for the last 6 months

    Lots of hi capacity AAA on eBay such as:
    http://cgi.ebay.co.uk/8-AAA-1800mAH...rElectronics_Batteries_SM&hash=item3a5973124c

    £3.28 for 8

    Steve Terry
     
    Steve Terry, Jun 14, 2010
    #7
  8. john hamiliton

    Mark Ingle Guest

    I don't know whether the Sanyo Eneloop batteries are the same as all
    other hybrid batteries, but I find them so much better than standard
    NiMH batteries; though as you have pointed out, the rated capacities are
    similar. The USP is that they hold their charge, but in my experience
    they seem to be better at holding their full charge even after months of
    charge/discharges. These cost about 7 pounds for four AAAs from amazon,
    but IMO well worth the price premium.
     
    Mark Ingle, Jun 15, 2010
    #8
  9. "Hybrid" appears to be a marketing term for some brands of low
    self-discharge (amusingly abbreviated to "LSD") NIMH batteries.

    See http://en.wikipedia.org/wiki/Low_self-discharge_NiMH_battery
    and note some of the brand names.

    -- Richard
     
    Richard Tobin, Jun 15, 2010
    #9
  10. john hamiliton

    Mr. Benn Guest


    That's what I was about to suggest. These chargers prevent over- and
    under-charging by sensing the voltage of each cell while they are being
    charged.
     
    Mr. Benn, Jun 15, 2010
    #10
  11. john hamiliton

    Mr. Benn Guest

    Hybrids have slightly less capacity than regular NiMH batteries but lower
    self-discharge rate and hence longer shelf life. For a DAB radio that's not
    used infrequently, I'd be inclined to use regular cells.
     
    Mr. Benn, Jun 15, 2010
    #11
  12. john hamiliton

    Ian Jackson Guest

    Are 'modern' DAB radios designed to work with the lower voltage you get
    from NiMH (1.2V compared with 1.5V for non-rechargeable)? I've not tried
    it lately, but I recall that my DAB radio (my ONLY DAB radio) doesn't
    last long on rechargeables - maybe only an hour or two. After that, it
    will keep going for some time on FM.
     
    Ian Jackson, Jun 15, 2010
    #12
  13. john hamiliton

    OG Guest

    Ahem; it is also a characteristic that the voltage is higher for longer
    during discharge, so they trigger the 'low battery' warning later than
    standard NiMH cells.
     
    OG, Jun 15, 2010
    #13
  14. john hamiliton

    Ian Jackson Guest

    Noted. Thanks.
    Of course, in most sets, you can't simply add a couple more batteries.
     
    Ian Jackson, Jun 15, 2010
    #14
  15. john hamiliton

    Steve Terry Guest

    It depends on the battery case layout.
    e.g. a series pair of AA can be substituted with 3 x 2/3rd AA

    and C cells can be had in 2/3 3/5, etc. sizes

    http://www.powerstream.com/Size.htm

    Steve Terry
     
    Steve Terry, Jun 15, 2010
    #15
  16. That's going to be expensive on non-rechargeables! The end point
    voltage for alkalines is about 0.9 volts, and they spend quite a lot of
    their life below 1.2.
     
    David Woolley, Jun 16, 2010
    #16
  17. john hamiliton

    Ian Jackson Guest

    I know that 'shortened' battery sizes exist, but I've never used them
    myself. As they are non-standard, they are not so readily-available, and
    (although I haven't checked yet), guess that they are more expensive.
     
    Ian Jackson, Jun 16, 2010
    #17
  18. john hamiliton

    Graham. Guest

    Why "hybrid" then, usually means a mixture of techniques or technologies, much like this
    random cross-post
     
    Graham., Jun 17, 2010
    #18
  19. john hamiliton

    Bodincus Guest

    (17/06/10 15:35), Brian Gregory [UK]:
    Seconded. I have a Kodak digital camera that was particularly fussy
    about rechargeable batteries.
    It annoyed me so much I went to the lengths to hack the camera firmware
    and tamper with the low voltage trigger points.
    The camera runs on two AA batteries. The warning trigger point was set
    at 2.78V, and the shutdown point was at 2.50. That means 1.25V per
    battery. I mean, 1.25V!!!
    And - by the way - since when is the voltage of a battery an indication
    of the residual power in it?
    I have lowered the thresholds to 2.5V and 2.2V three years ago, and is
    running fine, even using the flash. Not a corrupted picture, NOTHING.
    In fact, I have the proof the camera manufacturers purposely keep the
    threshold high to sell you their specific (and hugely expensive) custom
    battery packs. I got one to sample it, and the output voltage - fresh
    out of the box - was 3.89V. Almost one volt over the standard.
    All devices that are built to use rechargeable batteries, and declare
    they accept rechargeable batteries in their literature, must be
    engineered and built with a 1.2V per unit target.
    A NiMH battery at 1.0V has a massive amount of energy left in it, so the
    device MUST adapt and accept lower voltages to squeeze every ounce of
    energy out of the battery.
    In the light of the new "green this and that" I would vouch to declare
    illegal any device that doesn't follow this sensible and proper guidelines.
    If a device you buy doesn't use energy efficiently, get your money back
    and let the company know you find their products and standards of
    manufacturing not acceptable, that what I did with Kodak.
    Although you might think "They're a giant, they don't care", I can tell
    you THEY DO. A LOT. they're particularly twitchy in these days if you
    hit the "green" button with customer relations.

    --
    Bodincus - The Y2K Druid
    ************************
    Law 42 on computing:
    Anything that could fail, will break at the worst possible mom%*= [email protected]@
    # Access Violation - Core dumped
    # Kernel Panic
     
    Bodincus, Jun 17, 2010
    #19
  20. [/QUOTE]
    Marketing. It combines the rechargability of rechargables with
    the long shelf-life of ordinary batteries. That's close enough to
    "hybrid" for a marketroid.

    -- Richard
     
    Richard Tobin, Jun 17, 2010
    #20
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