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10'000 mAh battery chargers

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

  1. deonb

    deonb Active Member

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    Mar 4, 2013
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    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?

    e.g.
    https://www.alibaba.com/product-detail/10000mah-external-portable-battery-charger-pack_60238444120.html?spm=a2700.7724838.0.0.sdTiw4&s=p

    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

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    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 Member

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    UK
    not so cheap when they burn your house down
     

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