Budget Mobile MXW1 Replacement Battery HYB201307 3.7V 1150mAh

Budget Mobile MXW1 — 3.7V Li-ion Replacement Battery (HYB201307)

This is a 3.7V, 1150mAh Li-ion cell built to replace the original HYB201307 battery in the Budget Mobile MXW1 smartphone. It fits the MXW1 directly — same connector, same form factor at 64.20 x 50.00 x 4.50mm. Swap it in when the original cell no longer holds a charge or the phone shuts down unexpectedly.

• MXW1 fitment: The MXW1 uses a fixed connector pinout tied to the HYB201307 spec. This cell matches that pinout and the BMS handshake voltage thresholds the phone expects, so the OS reads charge state correctly after calibration.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the MXW1 platform. The BMS accepted the cell without a protection-trip fault, and the fuel gauge IC registered state-of-charge within normal tolerance after one full cycle.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the MXW1 after a cell swap

This happens because the fuel gauge IC is still running the discharge curve it learned from the old, degraded cell. The new cell has a steeper voltage drop under load — modem activity and screen-on state both draw peak current that the old curve didn't account for. When voltage sags briefly under that load, the phone hits its hardware cutoff threshold even though the displayed percentage reads higher. One full discharge-charge cycle with fast charging off resets the coulomb counter and eliminates the cliff.

MXW1 not powering on after the replacement battery sat in storage

Li-ion cells self-discharge during storage. If the cell dropped below 2.5V, the BMS enters a lockout state to prevent damage and the phone won't respond to a normal boot attempt. Connect the phone to a wall charger — not a PC port — and leave it for 15–20 minutes without pressing the power button. The charge IC on the MXW1 can trickle current into a locked-out cell at around 100mA to bring it back above the 2.5V threshold, after which the BMS releases and normal charging resumes.