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Best way to determine 18650 capacity, resistance and condition ?

o.thornwall

I'd like to get idea on the best way or process to check the capacity, resistance and usable condition of used 18650 batteries ?

I plan on buying several hundreds of these batteries for an up coming project .

 

Thank you, Oscar.

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  • Is it better to test for resistance when the cell is fully charged or fully discharged ? Anyone know ?

     

    Thank you.

  • in reply to o.thornwall

    The problem is defining exactly the point of total discharge, When I test them I fully charge them and then time how long it takes for them to discharge at a specified current to a lower voltage point. I can then rank the batteries relative to one another and choose the ones that took the longest to discharge from full charge to the chosen voltage point. To do this test I used an electronic load and a piece of test equipment that was built specifically for timing long duration events.

     

    John

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  • in reply to o.thornwall

    The problem is defining exactly the point of total discharge, When I test them I fully charge them and then time how long it takes for them to discharge at a specified current to a lower voltage point. I can then rank the batteries relative to one another and choose the ones that took the longest to discharge from full charge to the chosen voltage point. To do this test I used an electronic load and a piece of test equipment that was built specifically for timing long duration events.

     

    John

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