HTC HD7 BA S460 Replacement Battery 3.7V 2100mAh

HTC HD7 / T9292 — 3.7V Li-ion Replacement Battery (BA S460)

This is a 3.7V 2100mAh Li-ion replacement battery for the HTC HD7 and T9292 smartphones. It uses OEM part numbers BA S460, BD29100, 35H00143-01M, and 35H00154-04M. If the original cell has degraded or failed entirely, this unit restores power to the device.

• HD7 and T9292 compatibility: Both the HD7 (PD29110) and T9292 share the same battery bay dimensions, connector pinout, and charge IC handshake — the same 3.7V cell fits both without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the HD7 platform. The BMS accepted the charge IC handshake without fault codes, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: On first installation, disable any fast-charging accessory and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the HD7 after a cell swap

The HD7's fuel gauge IC retains the discharge curve of the previous cell in its coulomb counter. When a new cell is installed, the IC can misread the actual state of charge by a significant margin. Under modem radio or screen load, the real cell voltage drops faster than the gauge predicts, hitting the protection circuit's cutoff threshold while the display still shows 20–30%. One full discharge-charge cycle forces the IC to recalibrate. After that cycle, shutdowns at falsely reported charge levels typically stop.

HD7 not powering on after the battery sat in storage

Li-ion cells stored unused for extended periods can drop below 2.5V per cell — the threshold where the BMS enters lockout to prevent further discharge damage. The HD7 will show no boot activity and no charging indicator if this has occurred. Connect the device to a wall charger rated at 1A or higher and leave it for 20–30 minutes before attempting to power on. If the charge IC detects voltage above the recovery floor, it will trickle-charge the cell back into the normal operating window and the device will boot.