EB535163LA MetroPCS Admire 4G Replacement Battery 3.7V 1400mAh

MetroPCS Admire 4G / Galaxy S Lightray 4G — 3.7V Li-ion Replacement Battery (EB535163LA)

This is a 3.7V, 1400mAh Li-ion replacement battery for the MetroPCS Admire 4G, Samsung Galaxy Admire 4G (SCH-R820), and Galaxy S Lightray 4G. It replaces OEM part numbers EB535163LA and EB535163LAGSTA. Use this when the original cell no longer holds a usable charge or fails to power the device.

• SCH-R820 and Lightray 4G compatibility: Both the Admire 4G and Galaxy S Lightray 4G share the same battery bay dimensions, connector pinout, and BMS handshake protocol — that is why a single cell covers both devices without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SCH-R820 platform. The BMS accepted the cell on first insertion, reported voltage correctly, and the charge IC engaged without error flags.
• Fuel gauge recalibration on first use: After installing this cell, disable any fast-charge mode and run one full discharge-to-charge cycle. This lets the fuel gauge IC map its coulomb counter against the new cell's discharge curve before reporting accurate percentages.

Sudden shutdown at 20–30% on the Admire 4G after a cell swap

This happens because the fuel gauge IC is still running the discharge curve it learned from the old, degraded cell. When the modem transmits or the screen peaks, the new cell briefly sags in voltage — but the gauge hasn't recalibrated yet, so it reports 25% while the cell is actually near depletion under load. The fix is one complete discharge cycle from 100% down to automatic power-off, then a full uninterrupted charge. After that cycle, the coulomb counter resets to the actual cell capacity and the shutdowns stop.

Phone warm near the battery compartment during first charge

A new Li-ion cell has slightly higher internal impedance than a cell that has been cycled a few times. During the first charge, the charge IC pushes current into that higher-impedance cell, and some of that energy converts to heat rather than stored charge — this is normal and temporary. If warmth is concentrated at the battery cover and fades after the first full charge, no action is needed. If the device becomes hot to the touch or the charge stops before 100%, remove the battery and check that the connector seats fully flat against the contact pins.