Samsung SCH-R270 Replacement Battery AB463446BA 3.7V 800mAh

MetroPCS SCH-R270 / Chrono 2 — 3.7V Li-ion Replacement Battery (AB463446BA)

This 3.7V, 800mAh Li-ion cell replaces the original AB463446BA battery in the Samsung SCH-R270, SCH-R270U, and Chrono 2 flip phones on the MetroPCS network. It fits the compact battery bay on these clamshell handsets and restores power to devices where the original cell no longer holds a usable charge. Dimensions are 49.50 × 33.80 × 4.70mm — verify these against your existing battery before ordering.

• SCH-R270, SCH-R270U, and Chrono 2 fit: All three models share the same 3.7V battery bay geometry and connector pinout, which is why they use an identical cell. The BMS handshake on this platform is passive — no authentication chip — so the replacement cell seats and communicates without firmware rejection.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the SCH-R270 platform. The charge IC accepted the new cell without error flags, and the BMS held stable voltage across both standby and active call states.
• Fuel gauge recalibration after install: On first use, run the phone down to automatic shutoff, then charge uninterrupted to 100% without interruption. The SCH-R270's fuel gauge IC calibrates its coulomb counter against that first full cycle — skipping it causes the percentage display to lag or jump for the first several days of use.

Sudden shutdown at 20–30% on the SCH-R270 after a cell swap

This is a voltage-cliff problem, not a capacity problem. The fuel gauge IC on the SCH-R270 was calibrated to the discharge curve of the original aged cell — which sagged slowly and predictably. A fresh 800mAh cell has a steeper voltage drop in the final 20–25% of its charge window. When the phone's modem fires a transmit burst, it pulls current that drops cell voltage below the BMS cutoff threshold — around 3.0V — even though the gauge still reads 20–30%. One complete discharge-to-shutoff cycle lets the coulomb counter remap to the new cell's actual curve and eliminates most premature shutoffs.

Phone feels warm near the battery door during the first few charges

A new lithium cell has higher internal impedance than a cell that has been cycled several times. The SCH-R270's charge IC pushes a fixed current regardless of cell impedance, so the first one or two charges generate more heat as the cell's internal resistance dissipates some of that energy. This is normal and decreases after three to four full cycles as impedance drops. If the phone is still noticeably warm after five full cycles, check that the battery contacts on the phone are clean and making firm contact — corroded contacts increase resistance and amplify heating.