{"id":169134,"date":"2026-09-18T02:17:12","date_gmt":"2026-09-18T07:17:12","guid":{"rendered":"https:\/\/www.arbin.com\/?p=169134"},"modified":"2026-09-18T03:03:33","modified_gmt":"2026-09-18T08:03:33","slug":"run-the-cycling-test-until-the-capacity-decreases-to-80-of-original-capacity","status":"publish","type":"post","link":"https:\/\/www.arbin.com\/zh\/run-the-cycling-test-until-the-capacity-decreases-to-80-of-original-capacity.html","title":{"rendered":"Run the cycling test until the capacity decreases to 80% of original capacity"},"content":{"rendered":"

A common end-of-life criterion for lithium-ion cells is when the measured discharge capacity falls to 80% of its initial value. This document demonstrates how to configure an Arbin test schedule to automatically cycle a cell until this threshold is reached.<\/p>\n

Overall test procedure:<\/strong><\/h2>\n

Initial capacity measurement \u2192 Cycling loop \u2192 Compare capacity to 80% \u2192 Continue \/ End<\/p>\n

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\"overall<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

In this example, we assume that the cell has a minimum voltage of 2.5 V and a maximum voltage of 4.2 V.<\/p>\n

Step 1: Initial Rest<\/h2>\n

Allow the battery to rest for 10\u201330 minutes so that the voltage can stabilize. In this example, the rest time is set to 30 minutes.<\/p>\n

Step 2: Run a CCCV\u6052\u6d41\u8f6c\u6052\u538b<\/span><\/span><\/span> charge process<\/h2>\n

CC (constant current):<\/strong> Charge the battery at a constant current. In this example, 0.2C is used to obtain a stable baseline capacity measurement. Other charge\/discharge rates, such as 0.5C or 1C, may be used depending on the cell specification and test requirements.<\/p>\n

When the voltage reaches 4.2 V<\/strong>, switch to CV (constant voltage)<\/strong> mode and hold the voltage at 4.2V<\/strong><\/p>\n

End the charge when the current tapers down to a preset cutoff value, typically 0.05C<\/strong> or 0.02C<\/strong>. In this example, the cutoff current is set to 0.02C<\/strong>.<\/p>\n

Step 3: Rest After Charge<\/h2>\n

Let the battery rest for 10\u201330 minutes, <\/strong>in this case it\u2019s 30 minutes<\/p>\n

Step 4: Discharge the Battery to Measure Initial Capacity<\/h2>\n

Run a CC (constant current)<\/strong> discharge:<\/p>\n

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    Discharge the battery at a constant current. In this example, the current is set to 0.2C<\/strong>. In other cases, 0.5C<\/strong> or 1C<\/strong> may be used when testing under higher-load conditions.<\/p>\n<\/li>\n

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    Stop the discharge when the voltage drops to 2.5 V<\/strong>.<\/p>\n<\/li>\n<\/ul>\n

    \u6b65\u9aa4 5\uff1a<\/strong> During Step 4, the system calculates the discharge capacity over the entire discharge process. In Step 5, the total discharge capacity is recorded in the variable MV_UD1<\/strong> using the Set Values<\/strong> control type.<\/p>\n

    \u6b65\u9aa4 6\uff1a<\/strong> Start a loop using the Set Variable(s)<\/strong> control type. In this step, we reset the Discharge Capacity<\/strong> parameter along with three other parameters; otherwise, these values would continue to accumulate during the subsequent cycles.<\/p>\n

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    \"set<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

    The loop here is defined as Steps 6 through 11<\/strong>.<\/p>\n

    Step 7: Rest After Discharge<\/h2>\n

    Let the battery rest for 10\u201330 minutes, <\/strong>in this case it\u2019s 30 minutes<\/p>\n

    Steps 8, 9, and 10:<\/strong> These steps are the same as Steps 2, 3, and 4<\/strong>, respectively.<\/p>\n

    Step 11:<\/strong> Increase the cycle index without resetting any parameters.<\/p>\n

    The step limit is configured as follows: if the discharge capacity<\/strong> in the most recent cycle is less than 80% of the initial capacity<\/strong>, the test is terminated. Otherwise, the procedure returns to Step 6<\/strong>, which marks the beginning of the loop.<\/p>\n

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    \"set<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

    You can download this schedule template below and configure the parameters:<\/p>","protected":false},"excerpt":{"rendered":"

    A common end-of-life criterion for lithium-ion cells is when the measured discharge capacity falls to 80% of its initial value. This document demonstrates how to configure an Arbin test schedule to automatically cycle a cell until this threshold is reached. Overall test procedure: Initial capacity measurement \u2192 Cycling loop \u2192 Compare capacity to 80% \u2192 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