Sprint Rise SCP-49LBP Replacement Battery 3.7V 1200mAh

Sprint Rise / C5155 — 3.7V Li-ion Replacement Battery (SCP-49LBP)

This is a 3.7V, 1200mAh Li-ion replacement battery for the Sprint Rise (C5155 / KYC5155KIT). It fits the internal battery slot and connects via the original OEM connector. OEM part numbers covered: SCP-49LBP, SSCP-46LBPS, and 5AATXBT052GEA.

• Rise / C5155 platform fit: The C5155 family shares a single battery form factor — 65.10 × 43.90 × 4.80mm — across all carrier variants. The connector pinout and BMS handshake protocol match what the phone's charge IC expects, so the swap is straightforward once the back cover is off.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the C5155 platform. The BMS communicated correctly with the phone's fuel gauge IC, charge termination triggered at the right voltage, and the protection circuit tripped as expected on overcurrent.
• Fuel gauge recalibration on first use: On first installation, disable any fast-charge accessory and run one complete discharge-charge cycle at standard current. This lets the fuel gauge IC build an accurate discharge curve against the new cell before high-current sessions begin — skipping this step is the single biggest cause of erratic percentage readings after a cell swap.

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

The Rise's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-versus-capacity profile of the replacement. The phone's modem and display draw a burst of current, voltage sags below the shutdown threshold the IC is monitoring, and the phone cuts off — even though capacity remains. One full slow discharge down to automatic shutdown, followed by a full charge, forces the coulomb counter to reset its reference points against the new cell. After that cycle, the early shutdowns typically stop.

Sprint Rise won't power on after sitting in storage with a flat battery

Li-ion cells have a low-voltage lockout in the BMS. If the cell drops below approximately 2.5V — common after months in storage — the protection circuit opens and blocks current flow entirely. The phone appears completely dead and won't respond to a charger. To recover it, connect the phone to a wall adapter (not a PC USB port) and leave it for 15–20 minutes without pressing the power button — the charger IC needs time to trickle current past the BMS lockout threshold before the phone can boot. If the cell recovers, voltage will climb back above 3.0V and normal charging resumes.