About this replacement
Samsung Galaxy A71 / SM-A715F — 3.85V Li-Polymer Replacement Battery (EB-BA715ABY)
This is a 3.85V, 4100mAh (15.79Wh) Li-Polymer cell for the Samsung Galaxy A71 smartphone, covering SM-A715F, SM-A716U, and SM-A7160 variants. It replaces OEM part EB-BA715ABY and GH82-22153A. If your original cell has swollen, drops charge rapidly, or fails to hold voltage under screen or modem load, this cell addresses the root cause directly.
- A71 series cell compatibility: The SM-A715F, SM-A716U, and SM-A7160 all share the same battery bay geometry, connector pinout, and BMS handshake protocol. One cell format covers the full A71 platform without modification.
- Bench tested on actual hardware: We ran this cell in an SM-A715F chassis and confirmed the BMS completed a full charge cycle without triggering an overcurrent fault. The fuel gauge IC accepted the cell's discharge curve within one full cycle.
- First-cycle fuel gauge recalibration: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve accurately before high-current charging adds load to an uncalibrated cell.
Sudden shutdown at 20–30% on the Galaxy A71 after a cell swap
This is a voltage cliff issue, not a capacity problem. The Galaxy A71's modem and AMOLED display draw peak current together during active use, and if the fuel gauge IC is still calibrated to the old cell's discharge curve, it misreads the new cell's state of charge. The phone's power management IC hits a voltage floor earlier than the reported percentage suggests and cuts the supply rail. One full discharge-charge cycle at standard rate resets the coulomb counter against the new cell's actual curve. After that cycle, shutdowns at 20–30% typically stop.
USB fast charge not activating on the first cycle after replacement
After a cell swap, the A71's charge IC may default to trickle or standard charge rate on the first cycle — this is a BMS safety behaviour, not a fault with the charger or cable. The new cell's impedance profile is unknown to the charge IC until it completes one full cycle. Connect the phone to the original Samsung fast charger, let it complete a full charge to 100% and discharge to below 10%, then recharge. Fast charge protocol typically activates normally from the second cycle onward.