About this replacement
Motorola Moto Z2 Force — 3.8V Li-Polymer Replacement Battery (HD40 / SNN5987A)
This is a 3.8V, 2700mAh Li-Polymer battery for the Motorola Moto Z2 Force, Moto Z2 Force Edition LTE-A, and XT1789-01 variants. It replaces OEM part numbers HD40 and SNN5987A directly. If your original battery no longer holds charge or causes unexpected shutdowns, this cell matches the voltage rail and connector used across the Z2 Force line.
- Z2 Force compatibility across variants: The Moto Z2 Force, Z2 Force Edition LTE-A, and XT1789-01 all use the same HD40 cell with an identical connector, voltage rail at 3.8V nominal, and BMS handshake protocol — so one part number covers the full variant group.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the Z2 Force platform. The BMS accepted the cell without fault flags, charge IC ramped to expected current, and the fuel gauge IC registered state-of-charge correctly after one complete cycle.
- First-cycle fuel gauge recalibration: After fitting this cell, disable fast charging for the first complete discharge-charge cycle. The fuel gauge IC is still calibrated to your old cell's discharge curve — running one slow cycle lets it remap against the new cell before high-current charging begins.
Sudden shutdown at 20–30% on the Moto Z2 Force after a cell swap
This happens because the fuel gauge IC is still using the discharge curve from the old, degraded cell. When the phone hits a load spike — LTE modem transmitting or the display at full brightness — the new cell's actual voltage drops faster than the IC expects at that reported percentage. The processor interprets this as a critical voltage event and shuts down to protect the system. One full slow discharge-charge cycle corrects the IC's model, and the shutdowns stop. After calibration, the cell should sustain voltage above 3.5V under load until the gauge reads below 10%.
USB-PD or TurboPower fast charging not working on the first cycle after replacement
On first connection after a cell swap, the charge IC may not negotiate Motorola's TurboPower protocol with a new, uncalibrated cell. The phone defaults to standard 5V charging as a safety measure until the BMS confirms cell state. This is normal behaviour — it is not a fault with the charger or the new battery. Charge the phone once at standard rate through a full cycle, then reconnect your TurboPower adapter; the protocol handshake should complete and fast charge should resume at its normal input voltage.