Clevo EON17-S 14.8V Replacement Battery 6-87-P157S-4272

Clevo EON17-S — 14.8V Li-ion Replacement Battery (6-87-P157S-4272)

This is a 14.8V 5200mAh (76.96Wh) Li-ion replacement battery for the Clevo EON17-S gaming laptop and related P157S-platform notebooks. It fits across the EON17-S, EON117-S, EON15-S, and P17SM-A lines. OEM part numbers 6-87-P157S-4272, 6-87-P157S-4273, and P157SMBAT-8 all cross-reference to this cell.

• P157S platform compatibility: These models share the same 14.8V four-cell battery bay, connector pinout, and BMS handshake protocol. Clevo's whitebook chassis means the same physical battery ships across rebranded units — the EON15-S and EON17-S differ in display size, not power architecture.
• Bench tested on actual hardware: We cycled this cell through charge, load, and BMS cutoff on a P157S-platform unit. The BMS handshake completed without fault codes, and the protection circuit tripped correctly at the low-voltage threshold during a controlled discharge sweep.
• Post-install calibration on the EON17-S: After fitting, run the laptop on battery until it reaches hibernate cutoff — do not interrupt the discharge. Then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity curve and clears the false "poor health" flag that appears after every cell swap.

BIOS reporting battery health as poor after replacement on the EON17-S

The EON17-S BIOS reads health data from EEPROM registers carried over from the old cell. A fresh cell has no usage history in those registers, so the firmware flags it as degraded — not because the cell is faulty, but because the BIOS has no valid reference point yet. Running one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% writes a new baseline. After one or two cycles, the health indicator corrects itself. If the warning persists past three full cycles, check that the battery connector is fully seated — a partial connection causes intermittent EEPROM reads.

EON17-S shutting down at 20–30% charge shown on screen

This is a voltage cliff issue, not a capacity fault. Under full CPU and display load, the cell voltage drops faster than the fuel gauge IC can track — the gauge still shows 20–30% while actual cell voltage has already fallen below the BMS cutoff threshold, triggering an immediate shutdown. The fuel gauge IC needs calibration cycles against the new cell's discharge curve to tighten that tracking. Run two or three full discharge-to-hibernate cycles with a consistent load — gaming or a sustained CPU benchmark works well. By the third cycle, the gauge and BMS cutoff should align to within a few percent, and the early shutdowns stop.