As I had another 18650 battery, I purchased an additional case for Power Bank.
This time I purchased from eBay.
Because it is 120 yen, it was a little cheaper than when I bought it last time on Amazon. Only the case.
It is useless if you do not prepare the battery inside.
As price is cheap, I think that it is about input / output 1A.
The 18650 battery had 3000 mAh as shown in the picture, so theoretically, the charge time from 0 to 100% for 3 hours.
Easy to assemble.
Just insert the 18650 battery. I think that only the flat head type without projections on the tip can be inserted.
There is no problem with the operation.
While discharging (powering on something) is a blue LED, while charging is a red LED.
But I think that actually there is no capacity 3000mAh.
As 3.7V,
(3.7 V × 3000 mAh) ÷ (9 mm × 9 mm × 3.14 × 65 mm) = 693.75 Wh / L
That’s a bit unreasonable at the price of a 18650 battery (it was around 500 yen each).
But this is still close to realistic values (650-700 as of March 2019, of course the price is high).
I found it more amazing.
… There will not be 5800 mAh.
1341.25 Wh / L !!
And it is less than 300 yen per one.
I can still understand if it is a total of 5800mAh with four, but it is written even if you look at Description.
OMG. This is bad.
It’s too much.
There are 2300 Wh / L.
what? This does not exceed the theoretical value! ?
I can not remember immediately, but the total volume of the positive and negative electrodes in the battery is 50%, 500 Wh / L, which is a realistic value.
It is 1000 Wh / L even if the metal foil, the separator and the case have disappeared from the battery.
Even if all lithium is pulled out from lithium cobaltate, it is 2000.
If these batteries are loaded, my model S will run 3000km on a full charge.
Year!!
Please don’t have a dream.
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