BLU Dash X Plus LTE Replacement Battery 3.7V 2300mAh

BLU Dash X Plus LTE — 3.7V Li-ion Replacement Battery (C975339250P)

This is a 3.7V, 2300mAh Li-ion battery for the BLU Dash X Plus LTE (D0030UU) smartphone. It replaces part number C975339250P and slots into the same battery bay as the original cell. Voltage and capacity match the factory spec exactly.

• Dash X Plus LTE and D0030UU compatibility: Both model references share the same PCB layout, battery connector pinout, and BMS handshake protocol — one cell covers both. The 3.7V nominal rail and physical dimensions (97.05 × 52.45 × 3.82mm) are identical across the variant.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a monitored rig. The BMS accepted the charge profile without tripping overcurrent protection, and the cell held voltage within spec through the full discharge curve.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one complete discharge down to automatic shutdown, then charge to 100% uninterrupted. This gives the fuel gauge IC a clean reference curve against the new cell before high-current charging cycles begin.

Sudden shutdown at 20–30% on the Dash X Plus LTE after a cell swap

A new cell has a discharge curve the phone's fuel gauge IC has never seen before. The IC is still using the old cell's calibration map, so it misreads remaining voltage and lets the phone run into a voltage cliff — the cell drops below the modem's minimum rail before the OS triggers a normal shutdown. The screen and LTE radio together pull enough current to cause a rapid voltage sag that the uncalibrated gauge doesn't anticipate. Run one full discharge-to-shutdown and full recharge cycle to reset the coulomb counter against the new cell's actual curve.

Battery percentage jumping or reading incorrectly after replacement

The Dash X Plus LTE stores the previous cell's charge curve in the fuel gauge IC's learned table. When a new cell goes in, the IC reports percentage against data that no longer matches reality — so you see jumps, sudden drops, or a reading that freezes and then skips. This is not a fault with the replacement cell. Force a full recalibration: discharge the phone completely until it shuts itself off, then charge to 100% without interruption and without removing the charger early. After one complete cycle, the fuel gauge IC recalculates its reference and the percentage display stabilises.