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Ok, I found the data sheet. I see the capacity is 15,000 Mah.
So, according to the table, if a device using 120 Mah, it would last about 80 hrs.
Since the clock uses 30 Mah, that would be about 480 hrs.
480 hrs = 20 days.
That does not compute as AAs last around 60 days.
I assume that Time(H) = Capacity(Ah)/Current(A) equals a final battery voltage of 0 volts which will not work in my case.
I need a calculation for an ending voltage of around 2.0 volts.
I have a wall clock that uses 2 AA batteries.
I would like to use a transformer, but I get frequent power outages.
The clock uses about 30 mAh.
It lasts about 2 months before it starts losing time. (Around 2.0 volts for the 2 batteries.)
If I go with 2 D cell batteries, what kind of run time...
I have this package of 30 3 mm blue leds.
I do not recall where I bought them.
The pic shows one of them powered by a 18650 battery.
I was wondering what the forward voltage is?
I have some 30 gauge un-insulated wire.
Will that do?
If the heat does not affect the component life, then I can accept the heat.
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Thanks for the explanation.
So the Chinese are using a too low a power rating for the resistor.
For crying out loud. :-)
How much...
I bought some 12 VDC 5 mm red leds.
They work find but...
when I touch the wires going into the led, they were hot enough that I had to remove my hand.
That does not seem normal.
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