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Forum Best way to determine 18650 capacity, resistance and condition ?

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Best way to determine 18650 capacity, resistance and condition ?

o.thornwall over 4 years ago

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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genebren over 4 years ago

I think that the best way to test a batteries capacity to measure the complete charge and discharge cycle (voltage, current and time) to address the true storage. I did this on a recent project (Walky the Biped Robot - Power pack and Walky the Biped Robot - A new hope (actually a new body and battery) ) and I was quite surprised with the data (measured between 220mAh and 290mAh for a rated 1200mAh cell). There are a lot of junk batteries being sold out there, so it really does pay to test your battery capacity before relying on the stated values.
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genebren over 4 years ago

I think that the best way to test a batteries capacity to measure the complete charge and discharge cycle (voltage, current and time) to address the true storage. I did this on a recent project (Walky the Biped Robot - Power pack and Walky the Biped Robot - A new hope (actually a new body and battery) ) and I was quite surprised with the data (measured between 220mAh and 290mAh for a rated 1200mAh cell). There are a lot of junk batteries being sold out there, so it really does pay to test your battery capacity before relying on the stated values.
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