Electricity is generated in power stations in Watts (W). This must be

1.	Electricity is generated in power stations in Watts (W). This must be stored in a battery first before getting supplied (in solar energy, for example). So, in the battery module, why is the power stored is in the units mAh (milli-ampere hour)? How does the two unit Watts (W) and mAh are connected to each other? Also, why does the charger shows that: Input: 100-240V--2.5A 50-60 Hz and Output: 19.5V--6.7A (for example) and not the power supplied to the device's battery? (Which can, of course, be calculated by the formulae P=VI, which is both different at the input and output.
Answer» Electricity is generated in power stations in Watts (W). This must be stored in a battery first before getting supplied (in solar energy, for example). So, in the battery module, why is the power stored is in the units mAh (milli-ampere hour)? How does the two unit Watts (W) and mAh are connected to each other? Also, why does the charger shows that: Input: 100-240V--2.5A 50-60 Hz and Output: 19.5V--6.7A (for example) and not the power supplied to the device's battery? (Which can, of course, be calculated by the formulae P=VI, which is both different at the input and output.

Electricity is generated in power stations in Watts (W). This must be stored in a battery first before getting supplied (in solar energy, for example). So, in the battery module, why is the power stored is in the units mAh (milli-ampere hour)? How does the two unit Watts (W) and mAh are connected to each other? Also, why does the charger shows that: Input: 100-240V--2.5A 50-60 Hz and Output: 19.5V--6.7A (for example) and not the power supplied to the device's battery? (Which can, of course, be calculated by the formulae P=VI, which is both different at the input and output.

Answer»

Electricity is generated in power stations in Watts (W). This must be stored in a battery first before getting supplied (in solar energy, for example). So, in the battery module, why is the power stored is in the units mAh (milli-ampere hour)? How does the two unit Watts (W) and mAh are connected to each other?

Also, why does the charger shows that: Input: 100-240V--2.5A 50-60 Hz and Output: 19.5V--6.7A (for example) and not the power supplied to the device's battery? (Which can, of course, be calculated by the formulae P=VI, which is both different at the input and output.

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