Telus BERR160 Smartphone Replacement Battery 3.7V 1250mAh

Telus Mobility — 3.7V Li-Polymer Replacement Battery (BERR160)

This is a 3.7V, 1250mAh Li-Polymer replacement battery for the Telus Mobility smartphone. It replaces OEM part numbers BERR160 and 35H00068-01M. Capacity is rated at 4.63Wh — identical to the original cell specification.

• Telus Mobility platform fit: This cell matches the voltage rail, physical footprint (64.62 x 40.46 x 5.37mm), and connector orientation of the original battery. The BMS handshake between the charge IC and this cell follows the same communication protocol the modem and screen load expect during active use.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Telus Mobility platform. The BMS held stable across modem-active and screen-on load states, with no unexpected cutoff events during the draw spikes.
• Fuel gauge recalibration on first install: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. The fuel gauge IC is calibrated to the old cell's discharge curve — this single cycle lets the coulomb counter map the new cell before high-current charging pushes into an uncalibrated state.

Why the Telus Mobility reports wrong battery percentage after a cell swap

The fuel gauge IC stores a learned discharge curve from the original cell. When you install a new cell, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The phone reads voltage, maps it against the old curve, and outputs an incorrect percentage. One full discharge cycle — draining to automatic shutdown and charging to 100% without interruption — forces the IC to relearn the curve against the new cell and restore accurate reporting.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the modem or display's minimum operating threshold under load, even though the reported percentage still looks safe. Li-Polymer cells have a steep voltage cliff near end-of-discharge — under a simultaneous screen and modem draw, voltage can collapse faster than the fuel gauge tracks it. The BMS triggers a protective shutdown before the reported percentage reaches zero. After the fuel gauge IC completes one full calibration cycle, the reported percentage will align more closely with the actual voltage state and the premature shutdowns should stop.