Cordless Rotary
Without having a multimeter, how could I find the total amperage on 8 AA sized NiCD rechargeable batteries?
These 8 AA batteries make up the power pack for a 9.6V cordless Rotary Tool which are barely taking a charge anymore. All safety issues aside, I'd like to figure out the total amperage so that I can modify the tool to run from an AC to DC power supply. I realize that this would be easier to figure out if I had a multimeter to measure the current that the motor is pulling from the batteries in the power pack (I'm guessing that's how it'd be done). Could I just guess the amount by adding the general amperage on a normal AA Nicd battery that has it's mAh (Milliamp Hour) listed?
Yes the tool is at least a year old, though most likely two. So with that assumption if I had a power supply with an output of 9 volts would 888mA be enough?
Since each battery is 1.2 volts, and the output was 9.6 volts, they were wired in series so the amperage for the whole power pack is the same as the amperage for a single battery. If this rotary tool is a few years old the Nicd AA batteries put out around 1000 mAh. (They are up to 2700 today!)
Any 10 volt adapter that puts out more than 1 amp should work.
And yes, if you find a 9.6 volt power pack that uses AA size batteries and has the specs listed you could go with that number. Good idea, actually! But keep in mind the newer one will put out more because of advances in battery design.
(I replaced the old "D" sized nicad batteries in my bicycle light with new "C" size and got twice the power at half the weight)
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