10'000 mAh battery chargers

[deonb]

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-det...8444120.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.)

 

[miimura]

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.

 

[thegruf]

not so cheap when they burn your house down