Recent content by shadowjk

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    One MOSFET versus two MOSFETs in a protection circuit?

    mosfet is the component that either allows current to pass or doesn't allow it to pass. Two mosfets can presumably handle twice the current before shorting out and becoming useless. I guess it will be more robust against short circuit conditions.
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    AA - Is Quality Slipping ?

    I'm still using AA alkalines in my bluetooth hearing protectors, a set typically lasts about a week. The short time between putting them in, and replacing them, makes leaks extremely unlikely, I'd think. As for storage, not even the cheap china carbonzinc batteries I got with some product I...
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    Will we see another attempt of a 1.5V rechargeable cell just like how Ni-Zn once did?

    So, more or less, NiZn is like a gentler version of Li-Ion: They don't blow up when abused, they just die. The advantage of Li-Ion is that they blow up if abused or tortured, so you're pretty much forced to use some sort of battery management system, or protection circuitry, and as a result...
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    Phone battery balloned without any use!

    My phone in off mode draws battery empty in 2-3 months. The clock chip in it is still ticking when "off".
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    Why are button cell batteries made in so many different countries

    As for AA alkalines, i've had Energizers from Indonesia Duracells from Belgium Duracells from China other brands from Switzerland, Germany, Thailand, Taiwan... Either energizer or duracell from Thailand or taiwan too, I don't remember exactly.. :) but I can't remember ever having alkalines...
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    Is there any particular reason a device would use Li-Po instead of Li-on?

    I would caution against generalising statements like "LiPo can also supply much higher power than traditional LiCo". First, this isn't necessarily true. LiPo batteries are made from high-energy to high-power, just like cylindrical Li-Ion. The RC LiPos are optimized for high power. Cellphone...
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    liOn cell’s claim to fame A user’s charging habits may affect battery after all

    Coincidentally, that is also true for memory effect in NiCd. Discharge and charge, and it goes away. (Though there are other effects in NiCd and NiMH that can degrade things more permanently)
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    dead 18650 - no test charge yet working????

    You have measured a cell voltage over 4.2 Volts. You have measured a cell voltage below 2.5 Volts. You do not know the history of the cells. Any single one of the 3 items above is reason enough to recycle the cell. Also, you indicate that there is significant difference in cell voltage when...
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    Sad news for Eneloop lovers... Eneloop is ending a tradition in April 2013

    there are a few products with li-ion batteries inside under the eneloop brand. IIRC, hand warmers and phone chargers.
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    Sad news for Eneloop lovers... Eneloop is ending a tradition in April 2013

    Um, Panasonic and Sanyo both already make 18650?
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    Newbie question: So, a simple "set of rules" for safety - for single LI batteries?

    Re: Newbie question: So, a simple "set of rules" for safety - for single LI batteries The basic rule is: Make sure your batteries stay between 2.6 and 4.2 Volts. In practice it's kinda hard. You're almost never able to measure the batteries when in use, so 3.2 - 4.2 is a better range. As...
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    Sad news for Eneloop lovers... Eneloop is ending a tradition in April 2013

    I was just guessing what the numbers on the images were, since they seemed to match for Eneloop XX ;-)
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    Sad news for Eneloop lovers... Eneloop is ending a tradition in April 2013

    Looks like white = the old "normal eneloop": >1800mAh (AA) / >750mAh (AAA), 2100 cycles (cycle life improved?) black = old eneloop xx: >2450mAh (AA) / >900mAh (AAA), 500 cycles blue = old eneloop lite: >950mAh (AA) / >550mAh (AAA), 5000 cycles
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    Is this a sad day for energizer?

    A year or two ago I tested a bunch of alkaline batteries using C-9000 discharge @ 100mA. 1175 mAh "Energizer" 1550 mAh "Energizer Ultimate Hightech Alkaline" 1890 mAh "Energizer Ultra+" 1330 mAh "Duracell Plus" 1650 mAh "Duracell Procell" 1875 mAh "Duracell Ultra" 1625 mAh "Varta...
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    Sanyo Eneloop XX 2nd Gen (HR-3UWXB) test with a MH-C9000

    Heh. I did wonder why the hologram had chinese-looking writing on it instead of Japanese, but then I saw the eneloop.com.hk and sanyo.com.tw URLs on the pack :)
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