LeEco Le1s Compatible Battery LT55C 3.8V 3000mAh

LeEco Le1s / X500 Series — 3.8V Li-Polymer Replacement Battery (LT55C)

This 3.8V, 3000mAh Li-Polymer cell replaces part number LT55C in the LeEco Le1s and its X500, X501, and X502 variants. It fits the same footprint as the original at 73.50 × 63.00 × 4.10mm. Install it when the original cell no longer holds adequate charge or fails to power the device.

• X500 series compatibility: The Le1s, X500, X501, and X502 share the same battery bay dimensions, connector pinout, and BMS handshake logic. One cell covers all four models without modification.
• Bench tested on actual hardware: We cycled this cell through a full discharge-charge sequence and confirmed the BMS communicates charge state correctly to the OS. The protection circuit triggers at the rated low-voltage threshold without a false cutoff above 3.0V.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the Le1s after a cell swap

The Le1s fuel gauge IC stores a learned discharge curve from the old cell. When a new cell with a different internal resistance goes in, the IC miscalculates remaining capacity. Under modem transmission or screen-on load, current draw spikes and actual cell voltage drops faster than the OS predicts. The BMS hits the hardware low-voltage floor and cuts power before the reported percentage reaches zero. One full uninterrupted discharge-charge cycle lets the coulomb counter relearn the curve and eliminates early shutdowns.

Le1s not powering on after the replacement cell sat in storage

Li-Polymer cells self-discharge during storage. If the cell voltage drops below approximately 2.5V per cell, the BMS enters lockout mode to prevent damage and blocks normal boot. The phone shows nothing when the power button is pressed. Connect a known-good charger and leave it for 15–20 minutes — the charge IC will trickle current into the cell until voltage rises above the BMS recovery threshold, typically around 3.0V, at which point the phone will respond and begin a normal charge cycle.