Sanyo SCP-07LBPL Replacement Battery 3.7V 1000mAh

Sanyo SCP-5300 — 3.7V Li-ion Replacement Battery (SCP-07LBPL)

This is a 3.7V, 1000mAh Li-ion cell built to the SCP-07LBPL specification. It fits the Sanyo SCP-5300 feature phone directly, matching the original battery's footprint, connector, and voltage rail. Capacity is 1000mAh — identical to the factory spec listed for this handset.

• SCP-5300 platform fit: The SCP-5300 uses a single-cell Li-ion pack at 3.7V nominal. This replacement matches that voltage rail and the BMS handshake the phone's charge IC expects. No modification needed — the connector seats and the charge circuit accepts the cell as original.
• Bench tested on actual hardware: We ran the SCP-07LBPL through charge and discharge cycles on the bench. The BMS engaged charge termination correctly at 4.2V and held cutoff at the low-voltage threshold without tripping into lockout under normal load conditions.
• Fuel gauge recalibration on first use: After installing this cell, run one complete discharge down to automatic shutdown, then charge uninterrupted to 100% before normal use. The SCP-5300's fuel gauge IC is calibrated to the old cell's discharge curve — one full cycle lets it remap against the new cell and report accurate percentages.

Why the SCP-5300 reports wrong battery percentage after a cell swap

The SCP-5300 uses a fuel gauge IC that tracks charge state by learning the discharge curve of the installed cell over time. When a new cell goes in, the IC is still mapped to the old cell's curve — often a degraded one with a compressed voltage range. The mismatch causes the display to read 80% when the actual state of charge is closer to 50%, or drop suddenly near what it thinks is empty. One full uninterrupted discharge-charge cycle forces the IC to relearn the new cell's actual voltage-to-capacity curve and corrects the readout.

Sudden shutdown at 20–30% remaining on the replacement cell

This is a voltage cliff failure. Under screen-on or radio load, the cell's terminal voltage sags faster than the fuel gauge IC anticipates, crossing the low-voltage cutoff threshold before the displayed percentage reaches zero. On a fresh cell this is most common before the first full calibration cycle — the IC's empty-point estimate is set too high based on the old degraded cell. Complete one full discharge to shutdown and a full charge to 100%. If the shutdowns continue past two full cycles, check that the battery contacts on the phone are clean and making full contact, as high contact resistance amplifies voltage sag under load.