Samsung AB463446BC Replacement Battery 3.7V 650mAh

Samsung GT-E2520 / GT-M2510 Series — 3.7V Li-ion Replacement Battery (AB463446BC)

This is a 3.7V, 650mAh Li-ion cell replacing the original AB463446BC / AB463446BU battery. It fits the Samsung GT-E2520 and GT-M2510 alongside a wide range of compatible Samsung entry-level and mid-range handsets from the same era. Physical dimensions are 49.50 × 34.00 × 4.60mm — confirm against your existing cell before ordering.

• Cross-model fit — GT-E2520, GT-M2510, GT-E1150, GT-E1150C and more: These handsets share the same battery bay dimensions, 3.7V single-cell Li-ion architecture, and contact pad layout — which is why one part number covers all of them. The AB463446BC spec was Samsung's common denominator across this generation of compact voice-and-text phones.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on compatible hardware. The protection circuit triggered correctly at low-voltage cutoff and the charge IC accepted the cell without reporting fault codes on the first cycle.
• Fuel gauge recalibration after swap: Run one full discharge to auto-off, then charge uninterrupted to 100% before normal use. The phone's fuel gauge IC was calibrated to the old cell's discharge curve — skipping this step causes the percentage counter to read inaccurately until the IC re-anchors to the new cell's actual capacity endpoints.

Why the GT-E2520 reports wrong battery percentage after a cell swap

The phone tracks charge state using a simple coulomb counter or voltage-mapping fuel gauge IC that was trained on the original cell's impedance and discharge curve. A new cell has different internal resistance — especially at low temperatures — so the IC maps voltage readings to percentage incorrectly until it recalibrates. The most visible symptom is the percentage jumping several points suddenly or the phone powering off at a reported 15–25% remaining. One complete discharge-to-shutdown followed by a full uninterrupted charge resets the reference points the IC uses, and readings stabilise within two to three cycles.

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

Li-ion cells ship with a partial charge — typically around 40–60% — but self-discharge during storage can push the cell below the BMS lockout threshold of approximately 2.5V. When voltage drops that low, the protection circuit opens and the phone sees no power at all, even with the battery installed. Connect the phone to a wall charger rather than a PC USB port — wall adapters deliver enough current to nudge the protection circuit back into normal operation. Leave it on charge for 15–20 minutes before attempting to power on; if the battery has not recovered to at least 3.0V by then, the cell has likely over-discharged past recovery.