About this replacement
Samsung GT-S5800 / Wave S5800 — 3.7V Li-ion Replacement Battery (EB504465VU)
This 3.7V, 2400mAh Li-ion battery replaces the EB504465VU cell in the Samsung GT-S5800 and Wave S5800 smartphones. It fits the standard battery bay and connects to the same three-contact pad arrangement as the original. Capacity figures come from product data — 8.88Wh total energy.
- GT-S5800 and Wave S5800 compatibility: Both models run the same 3.7V battery rail, share the EB504465VU part number, and use an identical connector footprint — one cell covers both variants without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the GT-S5800 platform. The BMS accepted charge handshake on first connection, held voltage above the modem-load floor, and did not trigger thermal cutoff during a sustained data session.
- Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge mode and run one complete discharge-charge cycle at standard rate. This gives the phone's fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated coulomb counter.
Sudden shutdown at 20–30% on the GT-S5800 after a cell swap
The GT-S5800's fuel gauge IC retains the discharge curve from the previous cell. When the modem fires or the screen brightness peaks, current draw spikes and the new cell's voltage dips below the cutoff threshold — even though the percentage counter still reads 20–30%. The phone interprets the voltage drop as a fault and shuts down. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter against the actual cell curve and stops the premature cutoffs.
Phone won't power on after the replacement cell sat in storage
Li-ion cells self-discharge in storage, and the EB504465VU BMS will lock out the cell if terminal voltage drops below approximately 2.5V. The phone shows nothing — no logo, no charge indicator — because the BMS blocks current to protect the cell from deep-discharge damage. Connect the phone to a wall charger rated at least 1A and leave it for 15–20 minutes without pressing the power button. Once the BMS detects voltage climbing above its recovery threshold, the charge IC takes over and the boot screen appears.