Samsung SGH-E898 Replacement Battery 3.7V 880mAh Li-ion

Samsung SGH-E890 / SGH-E898 — 3.7V Li-ion Replacement Battery

This is a 3.7V Li-ion replacement battery rated at 880mAh (3.26Wh), built to fit the Samsung SGH-E890 and SGH-E898 handsets. Both models share the same battery bay, contact layout, and charge IC handshake. When the original cell degrades and no longer holds adequate voltage under load, this is the direct swap.

• SGH-E890 and SGH-E898 shared platform: These two handsets run the same 3.7V single-cell architecture with identical connector pinouts and the same charge controller IC. One battery fits both because the voltage rail, contact spacing, and BMS communication protocol are identical across the pair.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SGH-E890 platform. The BMS accepted the new cell without fault codes, charge termination fired correctly at 4.2V, and the protection circuit tripped as expected at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast or boost-charge mode for the first full discharge-to-charge cycle. The phone's fuel gauge IC was calibrated to the old cell's discharge curve — one uninterrupted cycle at standard current lets it remap against the new cell before resuming normal charge rates.

Why the SGH-E898 reports wrong battery percentage after a cell swap

The SGH-E898 tracks charge state using a fuel gauge IC that builds a model of the cell's voltage-to-capacity curve over time. When you install a new cell, that stored model no longer matches the actual discharge behaviour of the replacement. The IC keeps reporting percentages based on the old, degraded curve. One complete discharge down to automatic shutdown, followed by a full charge to 4.2V termination, forces the IC to rebuild its curve against the new cell's actual characteristics.

Sudden shutdown at 20–30% on the SGH-E898

This shutdown pattern points to a voltage cliff — the cell's internal resistance has risen to the point where it cannot sustain the voltage rail when the modem draws peak current during a call or data burst. The fuel gauge reads 20–30% based on open-circuit voltage, but under load the cell voltage collapses below the protection threshold and the phone cuts off. Fitting a fresh cell restores the low internal resistance needed to hold voltage steady under that transient load. Confirm the new cell holds above 3.6V under active call load to verify the fix.