HTC Touch Diamond 2 TOPA160 Replacement Battery 3.7V 2200mAh

HTC Touch Diamond 2 / Topaz 100 / T5353 — 3.7V Li-ion Replacement Battery (TOPA160)

This 3.7V 2200mAh Li-ion cell replaces the original TOPA160 battery in the HTC Touch Diamond 2, Topaz 100, and T5353 smartphones. It fits the same physical bay and connector as the factory unit. Capacity is rated at 8.14Wh.

• Touch Diamond 2, Topaz 100, T5353 fit: All three models share the same battery bay dimensions, contact pin layout, and BMS handshake protocol — which is why HTC used one SKU (TOPA160) across the range. The 65.04 × 40.29 × 8.68mm cell fits all three without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Touch Diamond 2 platform. The BMS communicated correctly with the device's charge IC, and the fuel gauge registered capacity without throwing low-battery errors at incorrect state-of-charge levels.
• Fuel gauge recalibration on first use: On first installation, disable any fast-charge accessories and run one full discharge-to-charge cycle on a standard 5V charger. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the Touch Diamond 2

The Touch Diamond 2 runs Windows Mobile, which relies on the fuel gauge IC's coulomb counter to estimate remaining charge. When the original cell ages, the counter's reference curve no longer matches the cell's actual voltage-capacity profile. A replacement cell has a steeper voltage cliff under modem or display load than the gauge expects — so the phone hits the hardware low-voltage cutoff before the OS percentage reaches zero. One full discharge-recharge cycle on a 5V standard charger resets the coulomb counter and eliminates most premature shutdowns.

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

Li-ion cells self-discharge in storage. If the cell drops below approximately 2.5V per cell, the BMS enters a lockout state and blocks normal charging to prevent thermal runaway on an over-discharged cell. The Touch Diamond 2 will show no charge indicator and appear completely dead. To recover, connect to a wall charger — not a PC USB port — and leave it for 20–30 minutes without pressing the power button. Most BMS circuits will accept a trickle from a wall adapter and exit lockout once the cell climbs above 2.9V, at which point normal charging resumes.