Leagoo Elite Y BT-S508 Replacement Battery 3.8V 2300mAh

Leagoo Elite Y — 3.8V Li-ion Replacement Battery (BT-S508)

This is a 3.8V, 2300mAh Li-ion cell built to replace the original BT-S508 battery in the Leagoo Elite Y smartphone. It fits the Elite Y directly and matches the original voltage and connector spec. Capacity is rated at 8.74Wh.

• Elite Y compatibility: The Elite Y uses a fixed 3.8V single-cell Li-ion architecture. This replacement matches that voltage rail and the original BMS handshake requirements so the phone's charge IC recognises the cell on first boot.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge sequences and monitored the BMS cutoff behaviour at both the high-voltage ceiling and the low-voltage floor. Cutoff triggers held within spec at both ends.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell has a steeper voltage drop under modem and screen load than the degraded original. The phone reads 25% on the old curve but the actual cell voltage has already crossed the BMS cutoff threshold. One full discharge-charge cycle with fast charging disabled forces the coulomb counter to reset against the real curve and eliminates the false-floor shutdown.

Device won't power on after sitting in storage at low charge

Li-ion cells stored below roughly 2.5V trigger a BMS lockout to prevent damage from over-discharge. The phone will show no response to the power button. Connect the phone to a wall charger — not a PC USB port — and leave it for 15–20 minutes without pressing anything. The charge IC trickle-charges the cell back above the BMS re-enable threshold, after which normal boot resumes. If the screen stays dark past 30 minutes on the charger, check the charging cable and adapter output voltage first.