NTT DoCoMo DSC-05D Compatible Battery 3.7V 2000mAh Li-ion

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

This is a 3.7V, 2000mAh (7.4Wh) lithium-ion cell for the NTT DoCoMo DSC-05D and Galaxy Note LTE handsets. It fits where the original cell has degraded and the phone can no longer hold adequate charge through a normal day. Physical dimensions are 67.50 × 51.90 × 5.90mm — confirm against your existing cell before installing.

• DSC-05D and Galaxy Note LTE fit: Both devices share the same cell footprint, voltage rail, and connector orientation. The BMS on each handset communicates over the same three-contact interface, so one cell covers both models without modification.
• Bench tested on actual hardware: We cycled this cell through charge and load on the bench and logged the BMS handshake. The protection circuit tripped correctly at the low-voltage cutoff, and charge acceptance held steady across the first three cycles with no thermal event.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge-to-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference points. Skip this step and the percentage readout may drift by 10–15% for the first week.

Why the DSC-05D reports wrong battery percentage after a cell swap

The fuel gauge IC stores a learned discharge curve from the old cell in non-volatile memory. When you install a new cell, that stored curve no longer matches the actual voltage-versus-capacity relationship of the replacement. The IC keeps reading against stale data, so the percentage shown on screen can lag or jump. One complete discharge-to-shutdown followed by a full charge to 100% forces the coulomb counter to reset its baseline against the new cell.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the modem radio or display pulls a high current burst and the cell voltage sags below the BMS cutoff threshold — even though the reported percentage looks safe. On a fresh cell that hasn't been calibrated yet, the fuel gauge IC can report 25% while the actual open-circuit voltage has already dropped near 3.5V under load. The fix is to complete two full discharge-charge cycles at standard current so the IC learns where the real voltage cliff sits. After calibration, the phone will shut down closer to 5% rather than cutting out mid-use.