Clarity PAL 3.7V Replacement Battery 1200mAh Li-ion

Clarity PAL — 3.7V Li-ion Replacement Battery

This is a 3.7V 1200mAh Li-ion replacement battery for the Clarity PAL mobile smartphone. It slots in place of the original cell when the factory battery no longer holds a usable charge. Capacity is 4.44Wh — matching the stock specification.

• Clarity PAL fit: The PAL uses a compact 62.18 × 38.14 × 4.50mm cell format with a low-current BMS tuned for the phone's modem and display load. The connector pinout and protection circuit match the factory cell — the phone's charge IC will recognise the battery on first boot.
• Bench tested on actual hardware: We cycled this cell through charge and load pulls that mirror modem-active and screen-on draw. The BMS held its low-voltage cutoff correctly and did not trip under the combined load of both subsystems running simultaneously.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Why the Clarity PAL reports wrong battery percentage after a cell swap

The PAL's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, the IC is still referencing the old curve — so percentage readings drift, spike, or plateau until recalibration happens. One full discharge to automatic shutdown followed by an uninterrupted charge to 100% resets the coulomb counter against the new cell's actual capacity. Until that cycle completes, percentage readings should be treated as approximate. After the first full cycle, readings stabilise.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem and screen draw simultaneous current and the cell voltage drops below the BMS cutoff threshold before the fuel gauge expects it. It is a voltage cliff — the cell cannot sustain voltage under that combined load at lower state-of-charge. The fuel gauge IC was calibrated to the old cell and does not yet know where this cell's voltage cliff sits. Run one full discharge cycle to shutdown and charge back to 100% — after that cycle, the IC repositions its low-voltage warning threshold to match the new cell, typically around 3.5V under load.