AK-V221 Emporia Active Glam Replacement Battery 3.7V 900mAh

Emporia Active Glam — 3.7V Li-ion Replacement Battery (AK-V221)

This is a 3.7V, 900mAh Li-ion replacement battery for the Emporia Active Glam and Active Glam 4G smartphones. It replaces OEM part numbers AK-V221 and AK-V221-4G. The cell fits the compact housing used across the V221 and V221 4G variants of this device.

• Active Glam and Active Glam 4G compatibility: Both the standard and 4G variants share the same battery bay dimensions (53.50 × 40.00 × 5.00mm), connector pin-out, and BMS handshake requirements — one cell covers both boards.
• Bench tested on actual hardware: We cycled this cell on the Active Glam 4G board and confirmed the BMS accepted charge at the correct 4.2V cutoff, with protection circuits tripping correctly on over-discharge below 2.75V.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge-to-charge cycle before normal use. The fuel gauge IC on this phone calibrates its discharge curve on the first full cycle — skipping this step causes the percentage counter to jump erratically during the first week.

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

This happens because the fuel gauge IC is still running the discharge curve it mapped to the old, degraded cell. A fresh 900mAh cell has a steeper voltage cliff than a worn one, so the phone hits a voltage the IC interprets as empty before the actual charge is gone. The fix is a single full discharge-charge cycle with no interruptions. After that cycle, the coulomb counter re-anchors to the new cell's curve and the shutdowns stop.

Phone won't power on after the replacement battery sat in storage

Li-ion cells self-discharge during storage, and if the cell drops below approximately 2.5V the BMS enters lockout mode to prevent damage — the phone will show nothing when you press the power button. Connect the phone to a wall charger (not a PC USB port) and leave it for 20–30 minutes without pressing anything. The charge IC trickle-charges the cell back above the BMS re-enable threshold, after which the phone boots normally. If the charge indicator never appears after 45 minutes, the cell has dropped below the recovery floor and needs replacement.