About this replacement
Samsung Galaxy Ace 4 / SM-G3139D — 3.8V Li-ion Replacement Battery (EB-BG319ABC)
This is a 3.8V, 1550mAh Li-ion replacement battery for the Samsung SM-G3139D, Galaxy Ace 4 CDMA, SM-G310A, and Galaxy Ace 4 LTE. It uses OEM part number EB-BG319ABC and fits directly into the original battery slot. Swap it in when the existing cell no longer holds a usable charge or causes unexpected shutdowns.
- Ace 4 platform compatibility: The SM-G3139D, SM-G310A, and Ace 4 LTE all share the same battery bay dimensions and connector pinout. The EB-BG319ABC cell fits all of them because Samsung used a single battery spec across that Ace 4 lineup — same voltage rail, same BMS handshake protocol.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an SM-G310A unit. The BMS accepted the cell without fault flags, completed full charge termination at 4.35V, and held stable voltage under simultaneous LTE data and screen-on load.
- Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after fitting this cell. The fuel gauge IC on these Ace 4 devices recalibrates its discharge curve during that first cycle. Running fast charge before recalibration pushes high current into an uncalibrated cell and skews percentage readings for days.
Sudden shutdown at 20–30% on the SM-G3139D after a cell swap
The Ace 4 fuel gauge IC stores a discharge curve from the old cell. When a new cell goes in, that stored curve no longer matches the actual voltage profile of the replacement. At 20–30% indicated charge, the new cell's voltage drops sharply under modem and display load — faster than the IC predicts. The phone interprets this as an immediate undervoltage condition and shuts down to protect the circuit. One full slow-charge discharge cycle overwrites the stored curve and brings reported percentage back in line with actual cell state.
SM-G3139D not powering on after the replacement battery sat in storage
Li-ion cells self-discharge in storage. If the EB-BG319ABC cell dropped below approximately 2.5V per cell during shipping or storage, the BMS enters a lockout state to prevent damage. The phone will show no response — no charging indicator, no boot. Connect the phone to a wall charger rated at least 5V/1A and leave it for 20–30 minutes without pressing the power button. The BMS trickle-charges the cell back above its recovery threshold before allowing normal charging to resume.