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Charge left in rechargeable battery?
d12345
Posts: 56 Forumite
Is there an easy way of telling how much charge there is left in a rechargeable AA battery?
I have an analogue multi meter.
I have an analogue multi meter.
0
Comments
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Test the voltage. Ni-Cd or Ni-MH?
Should be close to 1.5 or 1.6 volts when fully charged and drop.
The issue is that some devices are more sensitive to the lower voltage compared to non rechargable batteries. 1.5volt
1.2 volts and it will be dead for most devices. Someting low drain like a TV remote may work below that voltage.Censorship Reigns Supreme in Troll City...0 -
Not easily. The voltage will drop slightly as the cell discharges, and with an accurate meter and a calibration curve you can work it out. But that curve assumes that you're measuring the voltage across an open circuit and a cheap analogue meter certainly isn't that (and you don't want it to be, normally, because it wouldn't be any user as a tester for disposable batteries).
If you have a meter with a high input impedence, then measure the battery fully charged, measure it discharged, and plot a straight line. As a first approximation, 50% voltage drop is 50% discharge. But if the meter is a typical moving coil one, it'll probably not work as the voltage won't be stable enough when there's a current flowing.0 -
Rechargeable AA's are 1.2v by default, as are AAA's, C, and D cells.forgotmyname wrote: »1.2 volts and it will be dead for most devices. Someting low drain like a TV remote may work below that voltage.Understeer is when you hit a wall with the front of your car
Oversteer is when you hit a wall with the back of your car
Horsepower is how fast your car hits the wall
Torque is how far your car sends the wall across the field once you've hit it0 -
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