if you start with a battery that is rated at 3000mAhr, and it's nominal voltage is 1.5 volts, and then you put a load on it that draws 1000mA aka 1 amp, it should run about 3 hours
it should show 70% of 3 hours
(that's what I am thinking, please correct me if I am wrong.)
SUN rises from the east. Sure!Well, batteries don't get charged, they get energized.
But does it mean it will provide a constant current of 1000mA continuously over a period of 2 hours? But that to happen, won't it be necessary that the battery also maintains the terminal voltage at 4.2 V continuously over the time period? Is that possible?
Well, mAh along with voltage give you an indication of the energy. E=VIt. mAh is I * t. So, mAh is indicative of energy stored by the battery. But the output current will depend on the output resistance and potential difference. And the battery energy storage time depends on the output current. You have to also factor in the losses in the internal resistance and other factors contributing to inefficiencies.
And remember that the terminal voltage of a battery does not remain constant. As battery is discharged, the terminal voltage decreases.
Hope this helps.
Tahmid.
So, what I could gather from my own thinking and reason, as well as the discussion on here, 1400mAh gives no information about how much current will be "delivered" for what time period but it simply tells us that suppose there is a conductor (doesn't matter what the resistance,length,resistivity is) that has a current of 1400 mA flowing through it, then the amount of charge that has passed through the conductor in that hour is the amount of charge stored in the battery. That is, it is simply an indirect way of stating the amount of charge stored in the battery. Is this correct?
So, what I could gather from my own thinking and reason, as well as the discussion on here, 1400mAh gives no information about how much current will be "delivered" for what time period ..... Is this correct?
No, it is incorrect. It most certainly does tell us the current which it can deliver versus time. That's the whole purpose and meaning of the ampere/hour capacity.
You obviously do not understand what I wrote in my post #13.
To recapitulate:
The ampere/hour capacity of a cell or battery is the product of current and time. But note that the figure is usually given for a discharge time of 10 hours.
Over shorter times the capacity is rather less because the implied higher current generates greater heat, but that is a detail which needn't bother us for this explanantion.
A 1400mAh cell or battery should be able to supply 1.4A for 1 hour, 14A for 6 minutes (0.1 hour), 140mA for 10 hours, 14mA for 100 hours, 700mA for 2 hours, 350mA for 4 hours, 1A for 1.4 hours, etc etc, ad infinitum.
I still can't seem to buy that. What does the statement "A 1400mAh cell or battery should be able to supply 1.4A for 1 hour" even mean? For a battery of 7.2Ah, a load which demands 7.2A from the battery if connected to it will run for one hour and then suddenly stopping after an hour? It would imply that the battery would have to keep supplying 7.2A to the circuit for one hour (or nearly the same) but that just doesn't seem right from experience!
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