Oricom ezy100 KEBT-5057 Replacement Battery 3.7V 1200mAh

Oricom ezy100 / ezy120 — 3.7V Li-ion Replacement Battery (KEBT-5057)

This is a 3.7V 1200mAh Li-ion cell replacing part number KEBT-5057 in the Oricom ezy100 and ezy120 mobile phones. Both handsets share the same battery bay dimensions and connector pinout, so one cell covers both models. Capacity is rated at 1200mAh (4.44Wh) — the same spec as the original.

• ezy100 and ezy120 compatibility: Both models run the same 3.7V single-cell architecture with an identical connector and BMS handshake protocol. The shared battery design means the fuel gauge IC on each handset reads the same cell chemistry without requiring separate calibration profiles.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the ezy100 platform. The BMS accepted the cell without a lockout event, and the protection circuit tripped correctly at the low-voltage cutoff threshold during deep discharge testing.
• Fuel gauge recalibration on first cycle: After installing a new cell, run one complete discharge down to the automatic shutoff point before recharging fully. The handset's fuel gauge IC was calibrated to the old cell's discharge curve — skipping this step causes the percentage readout to drift by as much as 15–20% within the first few days.

Sudden shutdown at 20–30% on the Oricom ezy100 after a cell swap

This happens because the fuel gauge IC still holds the discharge curve from the worn original cell. A new cell has a steeper voltage cliff at lower states of charge — the phone's modem or screen pulls current, voltage sags below the protection threshold, and the device cuts power before the displayed percentage reaches zero. One full discharge-to-shutoff cycle followed by a complete charge resets the coulomb counter and aligns the percentage display to the new cell's actual voltage curve. After that cycle, early shutoffs typically stop.

Phone not powering on after the replacement cell sat in storage

Li-ion cells self-discharge during storage. If the cell voltage drops below approximately 2.5V, the BMS enters a lockout state and blocks current flow to protect the cell from damage. Plugging into the charger may show no response for the first few minutes — this is the charge IC applying a trickle current to bring the cell back above the 2.5V recovery threshold. Leave it connected for at least 10–15 minutes before attempting to power on; once voltage recovers above 3.0V, the BMS releases and normal charging resumes.