EB-BSD93B Panasonic GD93 Li-ion Replacement Battery 3.7V 750mAh

Panasonic GD93 — 3.7V Li-ion Replacement Battery (EB-BSD93B)

This is a 3.7V, 750mAh Li-ion replacement battery for the Panasonic GD93 mobile phone. It carries OEM part number EB-BSD93B and fits directly into the GD93 candybar handset. If your original cell no longer holds a charge through a normal day, this is the direct replacement.

• GD93 platform fit: The GD93 runs a single-cell 3.7V Li-ion pack with a low-current BMS matched to the phone's modest power draw. This cell uses the same voltage rail and connector, so the phone's charge IC communicates with the BMS without modification.
• Bench tested on actual hardware: We cycled this cell through the GD93's charge IC and monitored BMS handshake, charge acceptance, and cutoff behaviour at both ends of the voltage range. The cell reached full charge without trip events and discharged cleanly to the low-voltage cutoff.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge-to-charge cycle with fast charging disabled if your handset supports it. The GD93's fuel gauge IC was calibrated to the old cell's discharge curve — giving it one clean cycle against the new cell lets it re-anchor the percentage readings before normal use resumes.

Sudden shutdown at 20–30% on the GD93 after a cell swap

The GD93's modem and display pull a short burst of current that the aged original cell could not sustain — and a fresh replacement cell exposes this immediately. When the fuel gauge IC still holds the old cell's discharge curve, it can read 25% while the actual cell voltage under load drops below the 3.0V trip threshold. The BMS cuts power to protect the cell, and the phone shuts off. One full discharge-charge cycle forces the coulomb counter to re-map against the new cell, and shutdowns at false-low percentages stop.

GD93 won't power on after the replacement battery sat in storage

Li-ion cells self-discharge in storage, and if this battery sat long enough, the cell voltage may have dropped below 2.5V — the point where the BMS locks out to prevent damage. The phone will show nothing when you press the power button. Connect the handset to a charger and leave it for 15–20 minutes without pressing anything; the charge IC will push a low trickle current into the cell until it climbs back above the BMS re-enable threshold, typically around 2.9V. Once the phone shows a charging indicator, normal charge can resume.