AB463446BA USCellular SCH-R220 Replacement Battery 3.7V 800mAh

USCellular SCH-R220 / Chrono 2 — 3.7V Li-ion Replacement Battery (AB463446BA)

This is a 3.7V, 800mAh Li-ion cell for the Samsung SCH-R220 and SCH-R270 series flip phones on the USCellular network. It also fits the Chrono 2, SCH-R270U, and three additional models sharing the same OEM part number AB463446BA. Dimensions are 49.50 × 33.80 × 4.70mm — verify against your original cell before installing.

• SCH-R220 and SCH-R270 series compatibility: These models share the same battery bay footprint, voltage rail, and connector pinout. The AB463446BA OEM spec covers all variants listed, so one cell fits the full group without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SCH-R220 platform. The BMS accepted charge current without fault codes, and voltage held steady across call and standby loads.
• Fuel gauge recalibration on first cycle: After installing this cell, run one complete discharge down to auto-shutoff, then charge uninterrupted to 100% before daily use. The SCH-R220 fuel gauge IC calibrates its coulomb counter against the actual cell curve during this first cycle — skipping it causes the percentage readout to drift from the first day.

Why the SCH-R220 reports wrong battery percentage after a cell swap

The SCH-R220 uses a fuel gauge IC that stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual chemistry. The IC keeps calculating state-of-charge against old data until it recalibrates. One full discharge-to-shutoff followed by a complete uninterrupted charge resets the learning cycle. After that single cycle, the percentage readout tracks the new cell accurately.

Sudden shutdown at 20–30% on the replacement cell

A new Li-ion cell at rest can show 3.7V but drop sharply under the load of an active call or backlight. If the cell voltage sags below the BMS cutoff threshold — typically around 3.0V under load — the phone shuts down even though the gauge shows charge remaining. This is a voltage-sag failure, not a capacity failure. Completing the fuel gauge recalibration cycle described above helps, but if shutdowns continue past two full cycles, check that the battery contacts are clean and making firm contact at all four pins.