Ok, I have a few 2500 mah AA batteries, a few years old. I wish to test the miliamperage and see what they are at now, how well they have held up. I would also wish to test AAA batteries.
What are some ways i could do this? I do not have any equipment hooked up to my computer and will not buy any unless it is avalible at radioshack for less than $30. I have a voltometer.
2007-03-21 15:58:58 · 1 answers · asked by Bob Dole! 1 in Consumer Electronics ➔ Other - Electronics
Get a 1 ohm, 10 watt resistor from Radio Shack (1st link below) and an AA battery holder (2nd link below). Connect the resistor to the two leads of the battery holder; it needs to be soldered for this, because it's going to use a lot of current. Put it on something that can take some heat -- driveway, patio, or? Connect the voltmeter up across the resistor; when you put the battery in, it should read about 1.3VDC. The resistor will get hot, because you're putting 1.3 W into it. Time how long the voltage stays at or near the original reading. Multiply the time (in hours) you measured by 1300 mA (the amount of current that is flowing through the resistor) to get the mAh that the battery can give back after charging.
If you do this a lot, you'll be able to shorten your timing, because you will see that the small differences in the first measurements will be a reliable indicator for the final results.
2007-03-22 12:55:17 · answer #1 · answered by sd_ducksoup 6 · 0⤊ 0⤋