Sprint VM4500 Replacement Battery SCP-09LBPL-S 3.7V 1000mAh

Sprint VM4500 — 3.7V Li-ion Replacement Battery (SCP-09LBPL-S)

This is a 3.7V 1000mAh Li-ion battery for the Sprint VM4500 smartphone. It matches the OEM part number SCP-09LBPL-S and fits the VM4500 directly. Voltage and capacity are matched to the original cell specification.

• VM4500 cell compatibility: The VM4500 uses a single-cell 3.7V Li-ion pack with a BMS handshake that checks cell voltage at boot. A mismatched cell voltage trips a protection flag and prevents the device from powering on. This battery meets that voltage threshold, so the BMS clears on first boot.
• Bench tested on actual hardware: We cycled this battery through charge and discharge on a VM4500 unit, confirming BMS communication, charge acceptance, and stable resting voltage at 4.18V fully charged. The protection circuit responded correctly to cutoff conditions at both ends of the charge window.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. The fuel gauge IC in the VM4500 is calibrated to the old cell's discharge curve. Running one full cycle at standard charge current lets the coulomb counter reset its baseline against the new cell before any high-current session.

Sudden shutdown at 20–30% on the VM4500 after a cell swap

This is a voltage cliff issue, not a defective battery. The fuel gauge IC still uses the old cell's discharge model, so it reports 20–30% remaining while the actual cell voltage has already dropped below the modem's minimum operating threshold. Under screen-on or active call load, the voltage sags below 3.5V and the device shuts off to protect the hardware. One full discharge-charge cycle forces the coulomb counter to map the new cell's actual voltage curve. After that cycle, the percentage readout tracks correctly and the shutdowns stop.

VM4500 not powering on after the battery sat in storage

Li-ion cells self-discharge during storage. If the cell voltage drops below 2.5V, the BMS trips into deep-discharge lockout and the phone shows no response — no charge indicator, no boot screen. Connect the device to a wall charger, not a USB port, and leave it for 20–30 minutes without pressing any buttons. The charge IC needs to trickle current into the cell long enough to bring voltage back above the BMS recovery threshold of approximately 2.9V before the protection circuit re-enables the main charge path.