Panasonic EB-BSD67 GD67 Replacement Battery 3.7V 750mAh

Panasonic GD67 / GD68 — 3.7V Li-ion Replacement Battery (EB-BSD67)

This is a 3.7V 750mAh Li-ion cell built to the EB-BSD67 specification. It fits the Panasonic GD67 and GD68 candybar-style mobile phones. Voltage and connector match the original — no modifications needed.

• GD67 and GD68 compatibility: Both models share the same battery bay dimensions, connector pinout, and 3.7V power rail. The BMS handshake is identical across the two, so one cell covers both without any electrical compromise.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a GD67 unit. The BMS accepted the charge IC handshake without fault, and voltage held steady through the mid-discharge curve where aged cells typically sag.
• Fuel gauge recalibration on first cycle: The GD67's fuel gauge IC was calibrated to the original cell's discharge curve. After fitting this replacement, run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the IC a clean reference cycle and stops erratic percentage readings from the first week of use.

Sudden shutdown at 20–30% on the GD67 after a cell swap

This is a voltage cliff issue, not a capacity fault. The GD67's modem draws a short high-current pulse when transmitting — if the cell's internal resistance is slightly higher than the original, voltage drops below the protection threshold for a fraction of a second and the phone cuts out. It shows 20–30% on screen because the fuel gauge IC reads resting voltage, not load voltage. The fix is the same recalibration cycle: one full discharge to shutdown, one full charge to 100%, so the IC maps the actual load curve of the new cell. After that cycle, the reported percentage tracks real capacity under transmit load.

Phone warm near the battery compartment on the first few charges

A new high-impedance cell draws more resistive heat during the initial charge cycles than a broken-in original. The GD67's charge IC runs constant-current phase longer on a fresh cell, and that sustained current into slightly elevated impedance produces warmth at the battery bay. This is normal for the first two or three charge cycles and settles as the cell's impedance drops. If the phone stays warm beyond the third full charge cycle, check that the battery contacts are fully seated — a partial contact forces the charge IC to work harder to maintain current.