Motorola EZ30 Nexus 6 Replacement Battery 3.8V 3200mAh

Motorola Nexus 6 / Shamu — 3.8V Li-Polymer Replacement Battery (EZ30 / SNN5953A)

This is a 3.8V, 3200mAh Li-Polymer replacement cell for the Motorola Nexus 6 (Shamu). It fits the XT1100, XT1103, and XT1115 variants. The EZ30 cell sits beneath the rear housing and powers the Snapdragon 805 SoC, the 6-inch QHD display, and all radio modems.

• XT1100, XT1103, XT1115 compatibility: All three variants run the same 3.8V power rail and use the same physical cell format — 106.26 × 71.41 × 3.05mm with an identical flex connector. The BMS handshake is identical across the production run, so no firmware flag differentiates them.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Nexus 6 unit. The BMS accepted the charge protocol without fault flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold during deep discharge testing.
• Fuel gauge recalibration on first use: Disable Turbo Charging for the first full discharge-to-charge cycle after installation. The coulomb counter in the Nexus 6 is calibrated to the old cell's discharge curve. Running one uninterrupted slow cycle lets the fuel gauge IC map the new cell before high-current charging begins.

Why the Nexus 6 reports wrong battery percentage after a cell swap

The Nexus 6 uses a coulomb counter paired with a voltage lookup table burned to the fuel gauge IC during factory calibration. That table references the original cell's internal resistance and discharge curve. A new cell has lower impedance and a slightly different curve, so the IC misreads state of charge — often showing 100% while the cell is still at 4.1V. One full discharge to 3.4V followed by a slow charge corrects the mapping without any software intervention.

Sudden shutdown at 20–30% remaining on the replacement cell

This is a voltage cliff event, not a capacity problem. When the modem transmits or the display brightness spikes, instantaneous current draw pulls cell voltage below the BMS cutoff threshold — even though the fuel gauge still reads 25%. It happens most often on cells that have not completed a calibration cycle, because the IC does not yet know the cell's true low-voltage knee. Run one complete slow discharge to 3.4V, then charge fully. If shutdowns continue after two calibration cycles, check that screen-off battery drain is not keeping modem TX active in the background.