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BQ40Z60EVM-578: Unable to be fully charged

Part Number: BQ40Z60EVM-578

I'm using BQ40Z60EVM-578 to evaluate our Panasonic NCR 18650B 3400mAh, lithium Ion battery, 4 series, so the final output is 3.7v*4.

Power supply: BK precision 1762 DC power supply. Set output to 20V, current output is set to max.

Load: 40ohm resistor.

I just found an issue regarding partial charge. The battery can be charged until ~86%. After that, it will either stop charging or charge at low current(<26mA). The gas gauge stays on 86% after one night, and looks it won't resume charging. Discharge is successful, but resuming charge still can't be more than ~86%.

I attached my register snapshot and data memory export.

Thanks for review.

Lian

 data memory status_unable to fully charge.gg.csv.zip