Samsung Galaxy S10+ EB-BG975ABU Replacement Battery 3.85V 4000mAh

Samsung Galaxy S10+ — 3.85V Li-Polymer Replacement Battery (EB-BG975ABU)

This is a 3.85V, 4000mAh Li-Polymer replacement battery for the Samsung Galaxy S10+ (SM-G975W, SM-G975U, and related variants). It carries OEM part number EB-BG975ABU and slots into the same physical bay as the original cell. When the factory battery degrades and can no longer hold adequate charge under normal daily load, this cell restores full capacity.

• SM-G975 variant coverage: The S10+ launched across multiple carrier SKUs — SM-G975W, SM-G975U, SM-G975F, and others — but all share the same battery bay geometry, connector pin-out, and BMS handshake protocol. One part number covers the full variant range without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on SM-G975 hardware. The BMS accepted the cell on first insertion, charge current ramped correctly through CC/CV stages, and protection cutoffs triggered at expected voltage thresholds.
• Fuel gauge recalibration after install: On first use after installation, disable fast charging and complete one full discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference points — skipping this step causes erratic percentage readings for the first few days.

Sudden shutdown at 20–30% on the replacement cell

This is the most reported symptom after an S10+ battery swap and it is not a faulty cell. The fuel gauge IC stores a discharge curve learned from the original battery. When a new cell with a slightly different internal impedance profile is installed, the IC hits a voltage reference point it interprets as near-empty — usually around 3.6V under modem load — and triggers a protective shutdown. One full unconstrained discharge cycle, where the phone runs down to automatic shutdown naturally, forces the coulomb counter to relearn the actual cutoff voltage of the new cell. After one or two cycles, the shutdowns stop.

USB-PD fast charge not activating on first cycle after replacement

After installation, some S10+ units refuse to enter Adaptive Fast Charge or USB-PD mode on the first charge session. The charge IC handshake requires the BMS to report a valid cell voltage above approximately 3.0V before it negotiates higher current tiers. If the replacement cell arrived at a storage voltage below this threshold, the charger defaults to 5V/0.5A trickle mode. Leave the phone on charge for 20–30 minutes at trickle rate — once cell voltage climbs above 3.0V, disconnect, reconnect, and the fast charge negotiation will complete normally.