T54FJ - 6-Cell Replacement Battery Compatible with Dell Latitude E5420 E6420 XFR E6430 E6440 E6530 E6540 Precision M2800 - CPU Medics
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DELL T54FJ battery cell replaced ( chip bq30420 ) health is still fair – Laptop Battery Chip Reset, Reprogram and Repair – Laptop Battery Analyzer and Repair Forum