MyPhone 1080 Replacement Battery 3.7V 1300mAh MP-S-V

MyPhone 1080 / Halo X — 3.7V Li-ion Replacement Battery (MP-S-V)

This 3.7V 1300mAh Li-ion cell replaces part number MP-S-V (also listed as BS-04) in the MyPhone 1080, 9010, 9015TV, and Halo X smartphones. It restores normal power function when the original cell has degraded past the point of holding a usable charge. Voltage and capacity match the OEM specification exactly at 3.7V and 4.81Wh.

• Cross-model fit — 1080, 9010, 9015TV, Halo X: These four MyPhone models share the same battery bay dimensions (66.00 × 43.90 × 4.60mm), connector pinout, and 3.7V nominal voltage rail, which is why a single cell covers all four. The BMS handshake is consistent across this platform revision.
• Bench tested on actual hardware: We cycled this cell through full discharge and charge sequences on the Halo X. The BMS accepted the cell without fault codes, and the charge IC reached cutoff at the correct terminal voltage without thermal events.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard current. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the MyPhone 1080 after a cell swap

This happens because the fuel gauge IC is still running the discharge curve it learned from the old, degraded cell. When the new cell hits a voltage point the IC associates with near-empty on the old cell, the phone cuts power to protect the SoC — even though real capacity remains. The fix is a full calibration cycle: drain the phone until it shuts itself off, then charge uninterrupted to 100% without using the device. After one complete cycle the coulomb counter resets against the new cell and percentage reporting stabilises.

Phone will not power on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If the cell dropped below approximately 2.5V per cell, the BMS enters lockout mode and blocks charge input to prevent damage to an over-discharged cell. Plugging in a charger will appear to do nothing. Connect the phone to a wall adapter — not a PC USB port — and leave it for 15–20 minutes without pressing the power button. The charge IC trickle-charges the cell back above the BMS re-enable threshold, typically around 2.9V, at which point the BMS releases the lockout and normal charging resumes.