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High-precision, low-temperature drift lithium battery capacity test v1.3

Overview

The cost is approximately 30. The core control of the low-temperature battery uses low-temperature components. In terms of accuracy, besides using low-VOS op-amps, it also employs resistors with 0.01% accuracy.
The ADC accuracy has been specially processed, giving a 12-bit ADC the performance of a 16-bit ADC. The drawback is that the measurement range is only between 2.5 and 5.5. The program also integrates calibration.
A DCIR method for measuring internal resistance was also implemented and compared with AC measurement methods. Although the accuracy is not as high, it can at least reflect the quality of the lithium battery's internal resistance.
Of course, anyone can boast about this; please see the following videos:
Click to go -> High-Precision Lithium Battery Capacity Tester
Click to go -> Instructions for Use and Calibration
Click to go -> DC Internal Resistance Measurement

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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