NTT DoCoMo DSC-05D Replacement Battery 3.7V 2500mAh Li-ion

NTT DoCoMo DSC-05D / Galaxy Note LTE — 3.7V Li-ion Replacement Battery

This 3.7V, 2500mAh Li-ion cell replaces the original battery in the NTT DoCoMo DSC-05D and Galaxy Note LTE smartphones. It restores power to a phone that no longer holds charge after repeated cycle degradation. Capacity comes from product data: 2500mAh (9.25Wh).

• DSC-05D and Galaxy Note LTE compatibility: Both devices share the same battery bay dimensions, 3.7V nominal voltage rail, and connector pinout — the BMS handshake on each platform accepts this cell without triggering a non-OEM rejection flag.
• Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on the DSC-05D. The BMS accepted charge current without tripping overcurrent cutoff, and the protection circuit held steady through screen-on and modem-active draw.
• Fuel gauge recalibration on first use: On first install, disable fast charging and run one complete discharge-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC starts pushing higher current into an uncalibrated cell.

Sudden shutdown at 20–30% on the DSC-05D after cell replacement

This happens because the fuel gauge IC still holds the discharge curve of the old, degraded cell. When the new cell hits a voltage point the IC maps to 20–30%, actual cell voltage under modem or display load drops faster than the gauge predicts. The phone reads enough charge but the cell cannot sustain voltage under peak draw, and the BMS trips to protect the circuit. One full discharge-to-shutdown followed by a complete charge cycle recalibrates the coulomb counter to the new cell's actual curve.

Phone won't power on after replacement battery sat in storage

Li-ion cells in storage self-discharge over time, and if the cell drops below roughly 2.5V the BMS enters lockout mode and blocks charge current to prevent damage. The phone shows nothing — no charge screen, no vibration. Connect the phone to a wall adapter rather than a USB port, which delivers stable 5V at higher current, and leave it for 15–20 minutes before attempting to power on. If the BMS recovers, the charge screen will appear; at that point let the battery reach at least 3.6V before booting.