LeTV 1s Replacement Battery LT55C 3.8V 3000mAh Li-Polymer

LeTV Le 1s / X500 — 3.8V Li-Polymer Replacement Battery (LT55C)

This is a 3.8V, 3000mAh (11.4Wh) Li-Polymer cell built to replace the original LT55C battery in the LeTV Le 1s and X500 smartphones. It fits the standard Le 1s, Le 1s Dual SIM TD-LTE 32GB, and the X500 variant. When the original cell degrades and can no longer hold a stable charge, this swap restores the phone to a functional power state.

• Le 1s and X500 platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The LT55C part number covers the full range — no adapter or wiring modification needed.
• Bench tested on actual hardware: We ran charge and discharge cycles on the Le 1s with this cell installed. The BMS accepted a standard charge cycle without triggering overcurrent protection, and the fuel gauge IC initialised correctly after one full cycle.
• First-cycle fast charge lockout: On first use after installation, disable fast charging for one complete discharge-charge cycle. This allows the fuel gauge IC to recalibrate its coulomb counter against the new cell's discharge curve before high-current charging pushes load into an uncalibrated cell.

Sudden shutdown at 20–30% on the Le 1s after a cell swap

The Le 1s fuel gauge IC calibrates its percentage readout against the original cell's voltage-discharge curve. A new cell has a slightly different curve — so what the IC reports as 25% may be the actual voltage floor of the new cell under modem or display load. When the phone pulls peak current during a call or screen wake, the cell voltage sags below the BMS cutoff threshold and the phone shuts off. Run one full discharge to near-zero, then a full charge with fast charging disabled — the coulomb counter resets and percentage accuracy improves significantly.

Phone stays warm near the battery during the first few charges

A new Li-Polymer cell has higher internal impedance than a broken-in cell. The charge IC on the Le 1s pushes current into this higher-impedance cell, and the extra resistance converts some of that energy to heat. This is normal for the first two to three charge cycles as the cell's internal structure stabilises. If warmth continues past the third full charge or the back of the phone becomes hot to the touch, check that the adhesive securing the cell is not pressing the pouch against the rear housing — restricted airflow amplifies heat buildup.