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Thread: Battery Testing (AA)

  1. #1
    Seething Cauldron of Hatred TheAnimus's Avatar
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    Battery Testing (AA)

    So I saw this
    http://www.batteryshowdown.com/index.html

    And thought its quite interesting.
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    blueball (20-09-2012),CAT-THE-FIFTH (20-09-2012),kalniel (20-09-2012),MadduckUK (20-09-2012),mycarsavw (20-09-2012),peterb (20-09-2012),Phage (20-09-2012),Sputnik (20-09-2012)

  3. #2
    Banhammer in peace PeterB kalniel's Avatar
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    Re: Battery Testing (AA)

    Yeah, kind of falls into expected behaviour though. Do they explain anywhere why they give the same batteries different costs between the two sets of results (GP ultra for eg?)

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    Senior Moment blueball's Avatar
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    Re: Battery Testing (AA)

    Cheers for that. Very useful.

    Would like to see similar for rechargeable batteries
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  6. #4
    Banhammer in peace PeterB kalniel's Avatar
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    Re: Battery Testing (AA)

    Quote Originally Posted by blueball View Post
    Cheers for that. Very useful.

    Would like to see similar for rechargeable batteries
    Definitely, including self-discharge tests (though a pain to test for!).

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    Editable... jimbouk's Avatar
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    Re: Battery Testing (AA)

    A surprisingly good read for such a boring topic, thanks! Definitely stay away from the zinc batteries now, even for low powered items, and head for the Kodak batteries which I had no idea what they were like.

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    Re: Battery Testing (AA)

    Very interesting, thank you for sharing it with the community. Particularly good was the methodology giving a repeatable set of test results.

    However, my own view is that it re-enforces the case for rechargeable Li-Ion cells, and I have switched to the new generation of low self discharge Li-ion batteries (Sanyo Eneloop, Varta Hybrio and similar) for nearly all applications needing AA or AAA batteries. The only area where I can see justification for standard single use cells is where the equipment is particularly voltage sensitive.

    As other have said, it would be interesting to see similar tests on those types of battery.
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    Banhammer in peace PeterB kalniel's Avatar
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    Re: Battery Testing (AA)

    Quote Originally Posted by peterb View Post
    However, my own view is that it re-enforces the case for rechargeable Li-Ion cells, and I have switched to the new generation of low self discharge Li-ion batteries (Sanyo Eneloop, Varta Hybrio and similar) for nearly all applications needing AA or AAA batteries.
    There aren't (yet) any rechargeable li-ion AA or AAAs, as the basic cell has too high a voltage differential. Eneloop etc. are low discharge Ni-MH.

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    Seething Cauldron of Hatred TheAnimus's Avatar
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    Re: Battery Testing (AA)

    Rechargeable batteries....

    So whilst you can buy some fancy 2800mah ones, the issue often is voltage. As the power left in the battery decreases, so does the voltage output. As rechargeable are lower voltage than dry cells to begin with, this is a big problem, and often the rechargables still have plenty of power left inside them, just the voltage they output is so low, the electronics decide the cell is flat.
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    Re: Battery Testing (AA)

    Quote Originally Posted by blueball View Post
    Cheers for that. Very useful.

    Would like to see similar for rechargeable batteries
    Some time ago I did find a good review of lots of rechargeables AA batteries, I was surprised how many of them never charged to the printed capacity too.

    I have a Technoline charger and some of the fujicell 2800mAh cells only charged to around 1800-1900 after several full drain recharge cycles.

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    Re: Battery Testing (AA)

    Phone batteries would be a good one, mainly for the 3rd party replacements with ridiculous capacity claims. Get some real numbers to compare when buying.
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    The late but legendary peterb - Onward and Upward peterb's Avatar
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    Re: Battery Testing (AA)

    Quote Originally Posted by kalniel View Post
    There aren't (yet) any rechargeable li-ion AA or AAAs, as the basic cell has too high a voltage differential. Eneloop etc. are low discharge Ni-MH.
    Yes, my bad - a senior moment - yes, Ni-MH

    Quote Originally Posted by TheAnimus View Post
    Rechargeable batteries....

    So whilst you can buy some fancy 2800mah ones, the issue often is voltage. As the power left in the battery decreases, so does the voltage output. As rechargeable are lower voltage than dry cells to begin with, this is a big problem, and often the rechargables still have plenty of power left inside them, just the voltage they output is so low, the electronics decide the cell is flat.
    True, NI-MH (and NiCd) have a terminal voltage of about 1.2 volts, as opposed to Alkaline cells that are 1.5. The discharge characteristics are fairly flat though, which helps, but ideally, the equipment needs to designed to run off the lower voltage, or has to be bigger to accommodate extra cells (5 Ni-MH cells in series gives 6 Volts.

    The highest capacity Eneloops (and similar) are about 2000mAh in AA size, but because of the better self discharge performance, they are better (in many applications) than higher capacity 'normal' cells. All my remote controls have low self discharge batteries in them, I charge routinely every six months or so. Thee lower voltage doesn't seem to matter with them. I also use them in my flashgun, which works quite happily at 4.8V.
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    Re: Battery Testing (AA)

    Interesting, thanks for sharing. I will pick up some Kirkland (Costco) alkalines next time I am in store, they look to be a good all rounder.

    For most of the kids stuff I use rechargables (just cheap ones from 7dayshop) and they seem fine.

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