About this replacement
Samsung Galaxy A9 Pro 2018 / SM-G887 — 3.85V Li-Polymer Replacement Battery (EB-BA730ABE)
This is a 3400mAh (13.09Wh) Li-Polymer cell replacing OEM part EB-BA730ABE. It fits the Samsung Galaxy A9 Pro 2018, SM-G887, SM-G887N, and related TD-LTE variants. Voltage is 3.85V nominal — matching the original charge IC and BMS handshake parameters.
- SM-G887 and A9 Pro 2018 variant coverage: The SM-G887, SM-G887N, and TD-LTE siblings all share the EB-BA730ABE connector pinout, cell voltage rails, and BMS communication protocol. One cell part number covers the full regional variant spread because Samsung held the battery spec constant across those SKUs.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on SM-G887 hardware. The BMS accepted charge handshake without flagging an unrecognised cell error, and the protection circuit tripped correctly at the low-voltage cutoff threshold rather than allowing over-discharge.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC on the SM-G887 calibrates its coulomb counter against the cell's discharge curve on the first full cycle — running fast charging before that calibration pushes high current into a cell the gauge has not yet mapped accurately.
Why the SM-G887 reports the wrong battery percentage after a cell swap
The SM-G887 uses a coulomb-counting fuel gauge IC that builds its percentage model from the previous cell's charge and discharge history. When you fit a new cell, that historical model no longer matches the actual cell chemistry. The gauge reads percentage against stale data until it completes at least one full discharge-to-shutdown and full charge cycle. After that cycle, the reported percentage will track the actual cell state correctly.
Sudden shutdown at 20–30% remaining on the new cell
This is a voltage cliff failure. Under high-draw loads — LTE modem activity, screen at full brightness, or simultaneous background sync — the cell voltage drops faster than the fuel gauge predicts from its uncalibrated model, falling below the BMS cutoff before the percentage hits zero. The phone shuts down to protect the cell even though the gauge still shows charge remaining. Complete one full uninterrupted discharge cycle without fast charging to let the coulomb counter re-anchor to the new cell's actual voltage-versus-capacity curve, then recharge to 100% before resuming normal use.