EL40 Motorola Moto E XT1019 Replacement Battery 3.8V 2300mAh

Motorola Moto E XT1019 / XT830C — 3.8V Li-Polymer Replacement Battery (EL40 / SNN5944A)

This is a 3.8V, 2300mAh Li-Polymer replacement cell for the Motorola Moto E XT1019 and XT830C smartphones. It replaces OEM part numbers EL40 and SNN5944A directly. If your Moto E shuts down unexpectedly, won't hold a charge, or won't power on, a degraded original cell is the most common cause.

• XT1019 and XT830C compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The EL40 cell fits either variant without modification — same 73.30 × 50.51 × 4.40 mm footprint, same 3.8V charge termination point.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an XT1019 unit. The BMS accepted charge current without fault flags, and charge termination triggered correctly at 4.35V.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging pushes into an uncalibrated state.

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

The Moto E's fuel gauge IC retains the discharge curve it learned from the original cell. When a new cell is installed, the stored curve no longer matches the actual voltage profile of the replacement. Under load — modem activity, screen-on — the phone hits a voltage point the IC interprets as near-empty and cuts power. This is not a fault with the new cell. One full discharge from 100% to automatic shutdown, followed by a complete charge, resets the calibration window and clears the erroneous cutoff.

Phone warm near the battery compartment during the first charge

A fresh Li-Polymer cell typically has higher internal impedance before its first few cycles. The charge IC compensates by holding current steady, which generates more heat across the cell's internal resistance than a broken-in cell would produce. This is normal for the first one to three charge cycles and reduces as impedance drops. If the device stays noticeably hot beyond cycle three, check that the charger output does not exceed 5V 2A — the XT1019's charge IC is not rated for higher input voltages.