fuchs@czar.Princeton.EDU (Ira Fuchs) (11/29/90)
Can anyone provide me with or point me to construction details for a battery tester? I would like to be able to test standard AA,AAA,C,D, and perhaps N cnd other calculator/watch batteries. Thanks.
cgordon@vpnet.chi.il.us (Crash Gordon) (12/02/90)
>Can anyone provide me with or point me to construction details for a battery >tester? Basically, you want to apply a load to the cell under test, then read the voltage across the cell. The amount of load you want to use may vary, depending on the type of cell and the intended application. For N cells and larger (1.5v) a good bet is to place a 10 ohm resistor across the cell for a load, then look for at least 1.2v across the cell. For a 9v battery perhaps 68 ohms / 8 volts. Little button cells for watches etc. would be different; try 27 (or even 47) ohms and 1.1 volts. (Things that use button cells typically present a lighter load and have a better tolerance for low voltage.) A really top-notch tester would have a different load and pass/fail scale for each cell type. How to mechanically attach to the test cell, and how to display the results, are up to you. ----------------------------------------------------- Gordon S. Hlavenka cgordon@vpnet.chi.il.us Disclaimer: Yeah, I said it. So what?
strong@tc.fluke.COM (Norm Strong) (12/08/90)
In article <4347@idunno.Princeton.EDU> fuchs@czar.Princeton.EDU (Ira Fuchs) writes: }Can anyone provide me with or point me to construction details for a battery }tester? I would like to be able to test standard AA,AAA,C,D, and perhaps }N cnd other calculator/watch batteries. }Thanks. Frankly, I'd recommend one of the liquid xtal testers that comes with Eveready Alkaline cells. I think there is one for C & D cells and one for AA cells. They work well, and the price is right! -- Norm Strong (strong@tc.fluke.com) 2528 31st S. Seattle WA 98144