Mova 305 Replacement Battery 3.7V 1500mAh Li-Polymer

mova 305 — 3.7V Li-Polymer Replacement Battery

This 3.7V, 1500mAh Li-Polymer cell is a direct replacement for the mova 305 smartphone. It fits the 305 handset and restores power to calls, messaging, and apps. Capacity is 1500mAh (5.55Wh), matching the original cell specification.

• mova 305 fit: The 305 uses a slim Li-Polymer pouch cell running a 3.7V nominal rail. The charge IC and BMS on this handset expect a single-cell lithium profile — this replacement cell matches that profile, including the cutoff and charge termination voltages the board recognises.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under load typical of smartphone operation. The BMS held cutoff correctly at the low-voltage threshold and accepted charge termination without error flags on the host board.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

Why the mova 305 reports wrong battery percentage after a cell swap

The mova 305 uses a fuel gauge IC that builds its charge estimate from the discharge curve of the old cell. When a new cell goes in, the IC is still referencing the old curve — so the percentage it reports can be off by 15–25%. The fix is one full uninterrupted discharge down to automatic shutdown, followed by a full charge to 100%. After that cycle, the coulomb counter resets its baseline against the new cell and readings stabilise. Do not top up or interrupt mid-cycle — a partial cycle does not trigger a full recalibration.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops faster than the fuel gauge predicted — the phone's processor or modem draws a burst of current, voltage sags below the BMS cutoff threshold, and the device shuts off even though the reported percentage still looked safe. A fresh Li-Polymer cell at room temperature should hold above 3.5V under load at 20% charge. If shutdowns persist after one full recalibration cycle, check that the battery connector is seated fully — a high-resistance connection amplifies voltage sag under load and triggers premature cutoff.