Samsung XE550C22 Chromebook Compatible Battery 7.4V 6800mAh

Samsung XE550C22 Chromebook — 7.4V Li-Polymer Replacement Battery (AA-PLYN4AN)

This is a 7.4V, 6800mAh Li-Polymer battery for the Samsung Chromebook XE550C22 series, including the XE550C22-A02US and XE550C22-H01 variants. It replaces OEM part AA-PLYN4AN directly. Fit models share the same 7.4V two-cell configuration and connector pinout, so no adapter or modification is needed.

• XE550C22 series compatibility: The XE550C22, XW550C, XE550C22-A02US, and XE550C22-H01 all run the same two-cell 7.4V Li-Polymer pack with an identical BMS handshake protocol. Samsung's charge controller authenticates via the EEPROM data line — this cell carries the correct data structure to pass that check.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on an XE550C22 unit. The BMS accepted the pack without error flags, charge current stepped down correctly at 4.2V per cell, and the OS fuel gauge tracked accurately after one calibration cycle.
• Post-install discharge cycle on the XE550C22: After fitting this battery, run a full discharge through normal use until the Chromebook hibernates on low power, then charge uninterrupted to 100%. Chrome OS recalibrates its fuel gauge IC against the new cell during this cycle and clears the inaccurate health warning that appears after a cell swap.

Why Chrome OS reports poor battery health after fitting a new cell

Chrome OS reads battery health from EEPROM data written by the original cell over its service life. A new cell arrives with a fresh EEPROM state — the OS interprets this as a mismatch against its stored baseline and flags it as degraded or unknown. This is a firmware calibration issue, not a defect in the replacement cell. Running one complete discharge-to-hibernate followed by a full uninterrupted charge resets the learn cycle and restores accurate health reporting in the battery settings panel.

XE550C22 shutting down at 20–30% charge shown on screen

If the Chromebook powers off hard at 20–30% displayed charge, the fuel gauge IC has not yet mapped the new cell's actual voltage curve. The old cell's discharge profile is still cached, so the OS calls low-voltage cutoff earlier than the real cell threshold. Under combined CPU and display load, the voltage drop is steep enough to trigger an immediate shutdown before the gauge corrects itself. Run two full discharge-to-hibernate and full recharge cycles — by the second cycle, the fuel gauge tracks the new cell accurately and the early cutoff stops.