Emporia Solid AK-V33 Replacement Battery 3.7V 1450mAh

Emporia Solid — 3.7V Li-ion Replacement Battery (AK-V33)

This is a 3.7V, 1450mAh Li-ion replacement battery for the Emporia Solid mobile phone. It matches the OEM part number AK-V33 and slots into the same battery bay as the factory cell. Dimensions are 53.00 x 39.40 x 7.30mm — confirm against your original before installing.

• Emporia Solid compatibility: The Solid uses a fixed 3.7V single-cell architecture with a dedicated connector keyed to the AK-V33 form factor. Voltage rail and connector pinout match the original, so no modification is needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Solid platform. The BMS accepted the new cell without error flags, and charge termination triggered correctly at full capacity.
• Fuel gauge recalibration after swap: Run one complete discharge-charge cycle without interruption after installation. This lets the phone's fuel gauge IC map the new cell's discharge curve before drawing conclusions about remaining capacity.

Why the Emporia Solid reports wrong battery percentage after a cell swap

The Solid's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The phone reads voltage and maps it against the old curve, so the percentage shown can be several points off — often reading full when the cell is not, or dropping suddenly near the bottom. One full uninterrupted discharge followed by a full charge resets this calibration.

Sudden shutdown at 20–30% on the new cell

A fresh Li-ion cell at 1450mAh has a steeper voltage cliff than a partially degraded original. When the Solid's screen, baseband, and audio draw current simultaneously near that cliff, the cell voltage drops below the BMS cutoff threshold before the fuel gauge reaches 0%. This is not a faulty cell — it is the BMS protecting against over-discharge. After two or three full cycles the fuel gauge IC recalibrates and the shutdowns stop. If they persist past three cycles, check that the cell voltage under no load reads at least 3.6V after a full charge.