Nokia N95 HD7000 Replacement Battery 3.7V 1000mAh Li-ion

MITSUBA HD7000 / HDC-505 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1000mAh Li-ion cell from MITSUBA's X-Longer series. It fits the Nokia N95-based HD7000, HDC505, HDC-505, and Protax DC500T handsets. It replaces a degraded or failed original cell and restores normal device operation.

• HD7000 / HDC-505 platform fit: These models share the same 3.7V single-cell architecture, connector pinout, and BMS communication protocol — one cell covers all listed variants without modification.
• Bench tested on actual hardware: We ran this cell through charge, idle, and load cycles on the HD7000 platform. The BMS handshake completed on first insertion, charge acceptance was normal, and the protection circuit triggered correctly at low-voltage cutoff.
• Fuel gauge recalibration on first use: After installation, disable fast charging if available and run one full discharge-to-charge cycle before normal use. This lets the fuel gauge IC map the new cell's discharge curve — skipping this step often causes the OS to report incorrect percentages for the first several cycles.

Sudden shutdown at 20–30% on the HD7000 after a cell swap

The HD7000 fuel gauge IC stores a discharge model calibrated to the original cell. A new cell with a different internal resistance profile can show a voltage cliff that the old model doesn't predict correctly. The phone reads 25% but the actual cell voltage drops below the modem's minimum rail under transmission load. One full supervised discharge cycle — letting the phone run down to auto-shutdown — resets the coulomb counter and aligns the model to the new cell. After that cycle, the percentage readout and the actual cutoff voltage will track accurately.

Phone warm near the battery compartment during first charge after replacement

A fresh Li-ion cell often has slightly higher internal impedance than a run-in cell. During the first charge, the charge IC pushes current into that higher-impedance cell, and the energy loss across the internal resistance appears as heat. This is normal and typically resolves after two to three full cycles as the cell forms properly. If warmth is still noticeable after three cycles, check that the replacement cell is seated flat against the contact pads — any gap increases contact resistance and compounds the heating. Target: the rear casing should be warm but never hot to the touch.