About this replacement
Motorola Moto One Vision / XT1970 / One Action — 3.85V Li-Polymer Replacement Battery (SB18C43602)
This is a 3.85V, 3200mAh (12.32Wh) lithium-polymer replacement battery for the Motorola Moto One Vision (XT1970), One Action (XT2013-4), and related variants. It replaces OEM part numbers SB18C43602, SB18C43601, and KR40. Dimensions are 71.65 × 61.00 × 4.56mm — verify your original cell size before installing.
- Moto One Vision and One Action compatibility: Both the XT1970 and XT2013-4 run the same 3.85V battery rail, share the same connector pinout, and use the same BMS handshake with Motorola's charge IC. One cell fits both platforms without modification.
- Bench tested on actual hardware: We ran this cell on an XT1970 unit and confirmed the BMS accepted the new cell without throwing a charge fault. The charge IC stepped through trickle, CC, and CV phases as expected on the first cycle.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated state.
Sudden shutdown at 20–30% on the Moto One Vision after a cell swap
The XT1970's fuel gauge IC retains the discharge curve from the old cell after replacement. When the new cell hits its actual voltage floor, the IC hasn't recalibrated — it still expects the old curve, so the reported percentage doesn't match real cell voltage. Under load from the modem or display, the cell voltage drops below the BMS cutoff threshold before the OS can warn you. Run one full discharge from 100% to automatic shutdown, then charge to 100% uninterrupted — this resets the coulomb counter against the new cell.
USB-PD fast charge not activating on the first cycle after replacement
On the first charge cycle after fitting a new cell, the charge IC may stay in standard 5V charging mode and refuse to negotiate the fast charge protocol. This happens because the BMS needs to complete one full trickle-to-CV cycle to validate the new cell before it unlocks higher current modes. It is not a fault with the battery or the charger. Charge fully once on a standard 5W USB connection — fast charge will activate from the second cycle onward.