About this replacement
Samsung Galaxy Grand Prime — 3.8V Li-ion Replacement Battery (EB-BG530BBC)
This is a 3.8V, 2600mAh Li-ion cell for the Samsung Galaxy Grand Prime smartphone, including SM-G5308, SM-G5308W, and SM-G5309 variants. It replaces OEM part numbers EB-BG530BBC, EB-BG530BBE, EB-BG530CBB, and related references. Capacity matches the original spec — 9.88Wh — so the fuel gauge IC has accurate data to work against.
- Grand Prime variant coverage: The SM-G530 and SM-G531 series share the same 3.8V cell footprint, connector pinout, and BMS handshake protocol — that is why one part number covers the full range of Grand Prime regional models listed above.
- Bench tested on actual hardware: We cycled this cell on an SM-G5308W, monitoring charge termination and BMS cutoff behaviour across full charge and controlled discharge. The protection circuit responded correctly at both the low-voltage cutoff and the charge-complete threshold.
- Fuel gauge recalibration after swap: On first use after installation, run one complete discharge-to-charge cycle with fast charging disabled. This gives the fuel gauge IC one clean pass to map the new cell's discharge curve before high-current charging introduces additional variables into an uncalibrated counter.
Why the Grand Prime shuts down suddenly at 20–30% after a cell swap
The Grand Prime's fuel gauge IC stores a learned discharge curve from the old cell. When a new cell is installed, the IC applies that old curve to voltage readings it now receives from a different cell — the voltage-to-percentage mapping is wrong. Under modem load or screen-on bursts, the actual cell voltage drops faster than the IC expects, crossing the hardware shutdown threshold while the display still shows 20–30%. One full uninterrupted discharge-charge cycle rewrites the IC's reference data and corrects the cutoff point.
Phone not powering on after the replacement cell was stored for weeks
Li-ion cells self-discharge during storage, and if the cell voltage dropped below approximately 2.5V per cell, the BMS will have entered a lockout state to prevent damage. The phone will show no response to the power button. Connect it to a wall charger — not a PC USB port — and leave it for 15–20 minutes before attempting to power on. Wall chargers provide enough current for the BMS to exit lockout; PC USB ports often cannot. Once the BMS releases, the phone should boot normally and begin a standard charge cycle.