Hello, and Happy New Year to everybody.
My battery tester uses a (too weak) 10mA load for its 6V test.
I'm guessing that a 2CR5 Photo Lithium battery should be tested at
Any electronics geniuses out there? What type/size resistor should I connect to the battery, while testing with my battery meter, to simulate a Canon SLR's load, and provide me with an estimation of the usability of my 2CR5 (and other 6V lithium) batteries? I also have a DMM.
Thanks for all advise and tips.
I read in sci.electronics.design that snipped-for-privacy@yahoo.com wrote (in ) about 'Help! Building homemade photo lithium battery tester', on Sat, 1 Jan 2005:
To get 150 mA with 6 V, you need 6 V/0.15 A = 40 ohms. Power dissipated is 6 V x 150 mA = 0.9 W. If you are not going to keep the tester on the battery for more than a minute or so, a 39 ohm 1 W resistor is OK. 39 ohms is a standard value; 40 ohms isn't. It will get warm, but not too warm.
Also, depending on the battery used, I'm not sure 150mA is a good idea. Some Li-ion batteries have a maximum steady-state current below
100mA. If this is the case, the readings will be erronious. Perhaps this is why 10mA is used by default.Have something to add? Share your thoughts — no account required.
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