HTC P3650 Replacement Battery POLA160 3.7V 1350mAh

HTC P3650 / Touch Cruise — 3.7V Li-ion Replacement Battery (POLA160)

This 3.7V 1350mAh Li-ion battery replaces the original cell in the HTC P3650, Touch Cruise, Touch Find, and Polaris 100. It uses the same OEM part numbers POLA160 and 35H00101-00M and fits the same battery bay without modification. Voltage and capacity match the original spec exactly.

• P3650 / Touch Cruise platform compatibility: These models share a common battery bay format, connector pinout, and charge IC handshake. The same cell works across the P3650, Touch Cruise, Touch Find, and Polaris 100 because HTC used one battery spec across this platform generation.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the P3650. The BMS accepted charge from the onboard charge IC without error, voltage held stable across screen-on and modem-active draw, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: After fitting this cell, run one complete discharge down to auto-shutdown, then charge uninterrupted to 100% before normal use. The P3650 fuel gauge IC is calibrated to the old cell's discharge curve — skipping this cycle causes the percentage counter to read inaccurately for the first several days of use.

Sudden shutdown at 20–30% on the HTC P3650

The P3650 shuts down abruptly at 20–30% because the fuel gauge IC still references the discharge curve of the old, degraded cell. When modem activity or screen brightness spikes current draw, the new cell's voltage drops briefly below the threshold the gauge expects at that state of charge. The phone interprets this as a dead battery and cuts power. One full discharge-to-shutdown and uninterrupted recharge cycle resets the coulomb counter and eliminates this behaviour. After that cycle, the gauge tracks the new cell's actual curve and shutdowns stop.

Phone shows incorrect battery percentage after cell swap

The HTC P3650 uses a fuel gauge IC that builds its state-of-charge model from accumulated charge and discharge data on the installed cell. Swapping to a new cell does not reset this model automatically — the IC keeps using the old cell's learned curve, so the percentage display drifts or jumps within the first few charge cycles. To force a recalibration, drain the phone fully until it powers off on its own, then charge it to 100% without interruption. The gauge IC rebuilds its curve against the new cell during that single controlled cycle, and percentage accuracy stabilises from that point forward.