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10'000 mAh battery chargers

Discussion in 'Battery Discussion' started by deonb, Oct 14, 2016.

  1. deonb

    deonb Supporting Member

    Mar 4, 2013
    Redmond, WA
    I must be just displacing a decimal somewhere, but I can't find the error.

    Aren't these devices incredibly cheap for what they are? What am I missing?


    So that's let's say $5 for 10Ah @ 5V = 50Wh. (There are a bunch of places that sell them around the $5 mark).

    That makes this $100 per kWh, which is far lower than Tesla or GM gets for battery prices, and it's especially since cheap since this is a packaged product.

    What's stopping me from just buying 200 of these for $1000 and string together my own 10kWh powerpack? (Apart from common sense.)
  2. miimura

    miimura Active Member

    Aug 21, 2013
    Los Altos, CA
    Most likely the specs are not real and you would not really be able to get 50Wh out of that pack. Also, it's only 5V 1A, so it's C/10 discharge. 200 pieces would give measly 1,000W. I would also worry about the cycle life. More practically, you have to think about how you put energy back into each module. There is a separate connector for input and output. Of course, if you just used the bare cells out of these, then you could do something more straight forward.
  3. thegruf

    thegruf Active Member

    Mar 24, 2015
    not so cheap when they burn your house down

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