Dealsea.com: woot

The correct unit to show the capacity of a battery is not mAmp hour or Amp hour
It's Watt hour.
Without knowing the voltage, the 30000 mAmp hour is just an advertisement trick.
Does this battery supply 30Amp of 5V over 1 hour or 9V over 1 hour?
Watt = Amp x Volt
So if this power bank can provide continous 9 volt 30 Amp for 1 hour, this is a 270 Watt hour battery. 270Wh
If the 30 Amp is for 5 volts, this is a 150Wh battery.
So, the 30000mAmp hour by itself doesn't mean anything. It's just a big number to make you feel good.

7 months ago |

Anonymous

The output voltage must be 5V minimum but when they advertise 30Amp it's for the 3.7V cells inside the battery.
When you convert that to 5V, it is equivalent to 22Amp hour.
(3.7 / 5) = 0.74
0.74 x 30 Amp = 22 Amp.
And that's considering 100% efficiency in converting 3.7V to 5V which never happens.
There is atleast 10% energy loss during the conversion, as heat.
So you're down to 20Amp in the best case scenario.
So at best this can supply 20Amp of 5V for 1 hour.

7 months ago |

Anonymous

Is there a limitation of how many mah is allowed on an airplane?

7 months ago |

Anonymous

It's not by mAH. It's by Wh.
Below 100Wh is OK.
Between 100wh to 160wh needs prior approval.
For these power banks, which are 3.7V, if you want to keep it below 100Wh, it needs to be below 27Ah
100Wh / 3.7V = 27000 mAh

If you want to bother to get prior approval:
160Wh / 3.7V = 43000 mAh //@anonymous: Is there a limitation of how many mah is allowed on an airplane?

7 months ago |

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Anonymous

oos

6 months ago |