Samsung GT-B2710 Replacement Battery AB803446BU 3.7V 750mAh

Samsung GT-B2710 / Xcover 271 — 3.7V Li-ion Replacement Battery (AB803446BU)

This is a 3.7V, 750mAh Li-ion cell replacing part number AB803446BU in the Samsung GT-B2710, Xcover 271, and B2710 Solid. All three are rugged, waterproof handsets built for outdoor and industrial use. The cell slots into the same compartment as the original and uses the same three-contact connector.

• GT-B2710, Xcover 271, and B2710 Solid: These three models share the same battery bay dimensions, voltage rail, and connector pinout. Samsung used the same BMS handshake across the range, so one cell covers all three variants without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the GT-B2710 platform. The BMS accepted the cell without fault codes, charge termination triggered correctly at 4.2V, and low-voltage cutoff engaged at the expected threshold under simulated call and data load.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge mode and run one full discharge-to-charge cycle before normal use. The GT-B2710's fuel gauge IC was calibrated to the original cell's discharge curve. One full cycle lets it map the new cell before drawing heavy current against an uncalibrated reference.

Sudden shutdown at 20–30% on the GT-B2710 after a cell swap

The GT-B2710 drives GSM radio bursts that pull short, sharp current spikes. A new cell with slightly higher internal impedance than the aged original can sag below the BMS cutoff threshold during those spikes, even when the fuel gauge still reads 20–30%. The phone interprets the voltage drop as a dead cell and shuts off. After one full discharge-charge cycle, the fuel gauge IC recalibrates its coulomb counter to the new cell's actual discharge curve and the shutdowns stop.

Phone will not power on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If this cell dropped below approximately 2.5V before installation, the BMS may have tripped into lockout mode to protect the cell from damage. The GT-B2710 will show no response — no boot screen, no charge indicator. Connect the phone to a wall charger, not a PC USB port, and leave it for 15–20 minutes. The charge IC will trickle current into the cell to bring it above the BMS re-initialisation threshold, typically around 2.9V, before normal charging resumes.