Sprint QWEST ETC SCP-24LBPL Replacement Battery 3.7V 850mAh

Sprint QWEST ETC — 3.7V Li-ion Replacement Battery (SCP-24LBPL)

This is a 3.7V, 850mAh Li-ion replacement cell for the Sprint QWEST ETC feature phone. It slots directly in place of the original SCP-24LBPL pack and restores power to calls, messaging, and basic device functions. Capacity listed is 850mAh — use that figure when comparing against your original.

• QWEST ETC platform fit: The QWEST ETC uses a single-cell Li-ion pack at 3.7V nominal with a fixed connector orientation. This replacement matches that voltage rail and connector spec so the phone's charge IC sees the new cell the same way it saw the original.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS accepted charge current without tripping, held the 3.7V nominal rail under load, and hit cutoff at the correct low-voltage threshold without dropping out early.
• Fuel gauge recalibration after swap: After installing this cell, run one complete discharge down to automatic shutoff, then charge uninterrupted to 100% before normal use. The QWEST ETC's fuel gauge IC was calibrated against the old cell's discharge curve — one full cycle resets that reference point against the new cell.

Why the QWEST ETC reports the wrong battery percentage after a cell swap

The phone's fuel gauge IC tracks charge state using a stored discharge curve from the original cell. When a new cell goes in, that curve no longer matches the actual chemistry in the pack. The gauge reads against the old reference, so displayed percentages drift — often reading high in the upper range and then dropping sharply. One full discharge-to-shutoff and uninterrupted recharge lets the IC relearn the curve against the new cell. After that cycle, percentage readings stabilise.

QWEST ETC shuts off suddenly while still showing charge remaining

This is a voltage cliff failure. The cell voltage drops below the phone's minimum threshold under the load of a call or screen-on state, even though the resting voltage looked acceptable a moment before. On an aged or deeply discharged cell, internal resistance is high enough that any real draw collapses the terminal voltage instantly. If this happens on a new replacement cell straight out of storage, the BMS may have entered lockout below 2.5V — connect to a charger and leave it for 15–20 minutes before attempting to power on.