About this replacement
Acer Swift 3 SF713-51 Series — 15.4V Li-Polymer Replacement Battery (SQU-1605)
This is a 15.4V, 2600mAh (40.04Wh) lithium-polymer replacement battery for the Acer Swift 3 SF713-51 ultrabook line. It fits the SF713-51-M0AK, SF713-51-M16U, SF713-51-M6VV, SF713-51-M5PJ, and over 176 additional SF713-51 variants. All share the same SQU-1605 cell spec, connector pinout, and BMS handshake protocol.
- SF713-51 series compatibility: Every model in the SF713-51 line runs the same 15.4V rail and uses identical BMS communication over the same 5-pin connector. The SQU-1605 spec covers the full range — no adapter or modification needed across variants.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an SF713-51 unit. The BMS accepted handshake without error, charge current stepped down correctly at 80% and tapered cleanly to termination at 100%.
- Post-install calibration cycle: After fitting this cell, run the laptop on battery until it hibernates at low charge, then plug in and charge uninterrupted to 100%. This single cycle resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after fitting the SQU-1605
The SF713-51 BIOS reads health data from EEPROM stored in the battery controller — not from live cell voltage. When a new cell goes in, that EEPROM data reflects the old battery's wear history. The BIOS flags poor health because it hasn't yet written new baseline data for the fresh cell. One complete discharge-to-hibernate followed by a full uninterrupted charge gives the BIOS enough cycle data to overwrite the old EEPROM values. After that single learn cycle, the health status updates correctly.
Laptop shuts down at 20–30% charge shown on the Swift 3
This happens when the fuel gauge IC hasn't yet calibrated against the new cell's discharge curve. The IC was mapped to the old cell's voltage-to-capacity relationship, so it reads 25% while the actual cell voltage has already hit the low-cutoff threshold. The system shuts down to protect the cell even though the OS gauge still shows charge remaining. Run two full discharge-to-hibernate and charge-to-100% cycles — by the second cycle, the fuel gauge IC recalibrates and the shutdown point drops back to the correct low-voltage floor near 3.0V per cell.