About this replacement
Samsung Galaxy A5 2017 — 3.85V Li-Polymer Replacement Battery (EB-BA520ABE)
This 3.85V, 3000mAh Li-Polymer cell replaces the original battery in the Samsung Galaxy A5 2017, covering SM-A520S, SM-A520F/DS, SM-A520F, and related variants. It matches the OEM part number EB-BA520ABE and fits the stock battery bay without modification. Dimensions are 86.90 × 39.60 × 4.20 mm — confirm these against your existing cell before installing.
- A5 2017 variant coverage: The SM-A520 series shares one battery footprint and a single voltage rail across all regional variants. The connector pinout and BMS handshake logic are identical across SM-A520S, SM-A520F, and SM-A520F/DS, so one cell covers the full lineup.
- Bench tested on actual hardware: We ran this cell on an SM-A520F unit. The BMS accepted the charge handshake on the first cycle, charge current ramped correctly through CC/CV stages, and no thermal flags triggered during the full charge sequence.
- Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge-to-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.
Why the A5 2017 reports wrong battery percentage after a cell swap
The Galaxy A5 2017 uses a fuel gauge IC that tracks charge state by counting coulombs against a stored discharge curve. That curve was built on the original cell — when you install a new cell, the stored curve no longer matches actual cell behaviour. Until the IC recalibrates, percentage readings can be off by 10–20%. One complete discharge down to auto-shutdown followed by a full charge to 100% at standard current resets the reference curve and restores accurate reporting.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops sharply under load — typically during a modem burst, screen wake, or simultaneous background sync — faster than the fuel gauge IC predicts. The phone's protection circuit reads the voltage cliff as a critical low and cuts power before the displayed percentage reaches zero. It is not a faulty cell; it is an uncalibrated gauge reading a steep-sloped Li-Polymer discharge curve. Run two full discharge-charge cycles at standard current and the shutdowns stop once the IC learns the new cell's actual low-voltage knee, which sits near 3.4V under load.