LS1 BlackBerry Z10 Replacement Battery 3.7V 1800mAh

BlackBerry Z10 Series — 3.7V Li-ion Replacement Battery (LS1 / BAT-47277-003)

This is a 3.7V, 1800mAh Li-ion replacement battery for the BlackBerry Z10 smartphone, including the Z10 4G and Z10 4G LTE variants. It uses OEM part references LS1, ACC-51546-201, BAT-47277-003, and BAT-47277-001. The cell slots into the standard Z10 battery bay and connects to the device's charge and fuel gauge circuitry directly.

• Z10 family compatibility: The Z10, Laguna, Z10 4G, and Z10 4G LTE all share the same battery bay dimensions and connector pinout. The LS1 designation covers the full range, so no adapter or modification is needed across these variants.
• Bench tested on actual hardware: We cycled this cell through a full discharge and charge sequence on a Z10 unit. The BMS accepted the charge handshake without error, and the fuel gauge IC tracked state-of-charge across the complete curve without flagging a fault condition.
• Fuel gauge recalibration on first use: On first installation, disable fast charging if your Z10 supports it and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the Z10 after a cell swap

The Z10's fuel gauge IC stores a learned discharge curve from the previous cell. When you install a new cell, the stored curve no longer matches the actual voltage profile of the replacement. Under high-draw conditions — active LTE radio, screen at full brightness — the cell voltage drops faster than the gauge expects, and the phone shuts down to protect the cell even though the reported percentage looks safe. One full discharge-charge cycle forces the coulomb counter to re-map the curve against the new cell. After that cycle, the shutdown threshold aligns correctly with actual cell capacity.

BlackBerry Z10 showing wrong percentage after battery replacement

The OS percentage reading comes from the fuel gauge IC, not from the cell directly. After a swap, the IC is still referencing calibration data from the old, degraded cell. This causes the display to read 15–20% higher or lower than the actual state-of-charge. Run the phone down to the automatic shutdown point, then charge uninterrupted to 100% without removing the cable. That single full cycle resets the coulomb counter baseline and brings the percentage display back in line with the actual cell voltage.