NTT DoCoMo FOMA HT1100 Replacement Battery ELF0160 3.7V 2000mAh

NTT DoCoMo FOMA HT1100 — 3.7V Li-ion Replacement Battery (ELF0160)

This is a 3.7V, 2000mAh Li-ion battery built to fit the NTT DoCoMo FOMA HT1100 handset. It replaces OEM part numbers ELF0160, 35H00095-00M, and FFEA175B009951. If your HT1100 no longer holds a charge or shuts down unexpectedly, this cell is a direct swap for the original.

• FOMA HT1100 fitment: The HT1100 uses a specific connector orientation and BMS handshake tied to the 3.7V single-cell architecture. This battery matches that voltage rail and physical footprint — 50.84 x 36.65 x 10.78mm — so the BMS accepts the cell without throwing a charge fault.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the HT1100 platform. The BMS accepted the cell, charge termination triggered correctly at full voltage, and the protection circuit responded normally to load cutoff.
• Fuel gauge recalibration after swap: On first use, disable any fast-charge mode and run one full discharge-to-charge cycle. The HT1100's fuel gauge IC was calibrated to your old cell's discharge curve. Giving it one uninterrupted cycle lets it map the new cell before reporting accurate percentages.

Sudden shutdown at 20–30% on the HT1100 after a cell swap

This happens because the fuel gauge IC still uses the old cell's voltage-to-capacity curve. When the new cell hits a voltage point the old curve maps as 20–30%, the actual cell voltage may already be near the BMS cutoff threshold. The phone cuts out because the hardware hits the floor before the OS expects it. One full slow discharge-to-charge cycle forces the coulomb counter to relearn the new cell's actual capacity endpoints and clears this behaviour.

HT1100 not powering on after sitting in storage with a flat battery

Lithium-ion cells stored fully discharged can drop below 2.5V per cell, which triggers a BMS lockout to prevent unsafe charging. The HT1100 will show no sign of life — no boot screen, no charge indicator. Connect the phone to a low-current charger and leave it for 20–30 minutes without pressing any buttons. The BMS recovery circuit needs a trickle charge to bring cell voltage back above the 2.8V threshold before normal charging resumes.