Samsung Galaxy S4 B600BE Replacement Battery 3.8V 2600mAh

Samsung Galaxy S4 / GT-I9500 — 3.8V Li-ion Replacement Battery (B600BE)

This is a 3.8V, 2600mAh Li-ion cell replacing the original battery in the Samsung Galaxy S4 and Galaxy S4 LTE. It fits GT-I9500, GT-I9502, and the broader S4 variant range that shares the B600BE footprint and connector. Swap is tool-free — the back cover pops off and the cell lifts out.

• S4 variant coverage: The GT-I9500, GT-I9502, and LTE variants all use the same battery bay dimensions, connector polarity, and NFC antenna layer. One cell covers the full range without modification.
• Bench tested on actual hardware: We cycled this cell through the S4's charge IC and confirmed the BMS handshake completes correctly. The protection circuit trips at the expected low-voltage cutoff, and charge termination fires at full capacity — no false full readings on the first cycle.
• Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle. The S4's fuel gauge IC was calibrated to the old cell's discharge curve. Running one slow, full cycle gives the coulomb counter accurate reference points before high-current charging begins.

Sudden shutdown at 20–30% after fitting a new cell

This is a voltage cliff, not a capacity problem. The S4's processor, LTE modem, and display draw simultaneous current spikes that a new cell — not yet mapped by the fuel gauge IC — cannot sustain at predicted voltage. The phone interprets the resulting voltage dip as a dead battery and shuts down, even though charge remains in the cell. One full discharge-to-shutdown followed by an uninterrupted charge to 100% resets the coulomb counter's reference points. After that cycle, shutdowns below 20% should stop.

Phone shows incorrect battery percentage after cell swap

The S4's fuel gauge IC stores a learned discharge curve from the original cell. A new cell with different internal impedance throws those stored values off immediately. The percentage reading can jump, stall, or read 100% well before the cell is actually full. Run the phone down until it shuts itself off, then charge in one continuous session to full without interruption. That single cycle overwrites the old curve data and the gauge reads accurately from that point forward.