TCL One Touch Pop D5 Replacement Battery TLi018D1 3.7V

TCL One Touch Pop D5 / OT-5038 Series — 3.7V Li-ion Replacement Battery (TLi018D1)

This is a 3.7V, 1600mAh Li-ion battery for the TCL One Touch Pop D5 and its OT-5038 variants (OT-5038A, OT-5038E, and six additional regional SKUs). It replaces OEM part numbers TLi018D1 and TLi018D2. The cell fits the standard rear-access battery bay and connects via the original contact strip.

• OT-5038 variant coverage: The OT-5038A, OT-5038E, and other regional builds share the same 3.7V battery rail, connector pitch, and BMS handshake as the base D5 — one cell covers the full family without modification.
• Bench tested on actual hardware: We ran this cell through charge-discharge cycles on OT-5038 hardware and confirmed the BMS accepted the new cell, balanced correctly at top-of-charge, and held voltage above the low-battery cutoff threshold without premature shutdown events.
• Fuel gauge recalibration on first cycle: After installing this cell, disable any fast-charge mode and run one complete discharge-to-charge cycle before normal use. The D5's fuel gauge IC is calibrated to the old cell's discharge curve — one full cycle against the new cell lets it recalibrate the coulomb counter before high-current charging begins.

Sudden shutdown at 20–30% on the OT-5038 after a cell swap

The OT-5038's modem and display draw a combined current spike that causes voltage sag on a new, uncalibrated cell. The fuel gauge IC still shows 20–30% remaining because it hasn't yet mapped the new cell's actual discharge curve. When the cell voltage dips below the BMS cutoff — typically around 3.2–3.3V under load — the phone shuts down regardless of the percentage shown. One full discharge-charge cycle corrects the fuel gauge IC's reference data and eliminates the early shutdowns.

Phone reports wrong battery percentage after replacement

The D5 uses a coulomb counter in its fuel gauge IC, which was calibrated against the original cell's internal resistance and capacity profile. A new cell has different impedance characteristics, so the counter's reference values are immediately out of sync. This shows up as percentage jumps, stalled readings at a fixed number, or the indicator skipping from 15% to 1% without warning. Drain the battery fully until the phone powers off, then charge uninterrupted to 100% — the IC resets its reference curve on that single cycle.