About this replacement
HP ProBook 5310m / 5320m — 14.8V Li-Polymer Replacement Battery (HSTNN-C72C)
This 14.8V, 2400mAh (35.52Wh) Li-Polymer battery replaces the original cell in the HP ProBook 5310m and ProBook 5320m. It matches OEM part numbers HSTNN-C72C, HSTNN-SB0H, FL04, and several others listed below. Use it when your original battery no longer holds a charge or has stopped being recognised by the system.
- ProBook 5310m and 5320m fitment: Both models share the same 14.8V battery bus, connector pinout, and BMS handshake protocol. One cell covers both platforms — no wiring or adapter needed.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a ProBook 5310m. The BMS communicated correctly with the EC, reported state of charge accurately, and handled charge termination without tripping a fault.
- Post-install calibration for the ProBook: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the ProBook 5310m reports poor battery health immediately after a cell swap
The ProBook's BIOS stores capacity and health data in an EEPROM on the battery's fuel gauge IC. When you swap in a new cell, that EEPROM still carries counters from the old pack. The BIOS reads those stale counters and flags the replacement as degraded before it has cycled once. Running a full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the fuel gauge IC to rewrite its learned capacity data, clearing the false warning.
ProBook shuts down abruptly while the OS gauge still shows 20–30% charge
This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load, even though the OS fuel gauge reads higher. The fuel gauge IC calibrates against resting voltage, not loaded voltage — so under full draw, the cell hits the cliff before the gauge catches up. It is not a fault with the replacement cell itself; it is a calibration lag. Complete two to three full discharge-and-charge cycles and the fuel gauge IC will align its model to the actual cell, pushing the reported shutoff point below 10%.