Vodafone Smart E8 Li3822T43p4h736040 Replacement Battery 3.8V 2100mAh

Vodafone Smart E8 / VFD511 / VFD513 — 3.8V Li-ion Replacement Battery (Li3822T43p4h736040)

This is a 3.8V, 2100mAh (7.98Wh) Li-ion cell built to OEM part number Li3822T43p4h736040. It fits the Vodafone Smart E8, VFD511, VFD513, and Smart N8, among others. If the original cell is swollen, dead, or draining inside a day, this is the direct swap.

• VFD511 / VFD513 / Smart N8 platform fit: These models share the same 3.8V power rail, connector pinout, and charge IC handshake. One cell covers all of them without any wiring changes.
• Bench tested on actual hardware: We ran this cell through charge and discharge on the Smart E8 platform. The BMS accepted the charge IC handshake on the first cycle. Cutoff voltage held at the expected floor under screen and modem load.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. The fuel gauge IC is still calibrated to the old cell's discharge curve. One full cycle lets it map the new cell before fast charging pushes high current into an uncalibrated state.

Sudden shutdown at 20–30% on the Smart E8 after a cell swap

This happens when the fuel gauge IC is still reading the old cell's voltage curve. The phone thinks it has 25% left, but the new cell hits its voltage floor under modem or screen load and the BMS cuts out. It is not a faulty battery. The fuel gauge coulomb counter needs a full reference cycle to learn the new cell's actual capacity endpoints. Run the phone down to automatic shutdown, charge uninterrupted to 100%, and the shutdowns should stop. If they persist after two full cycles, check that the connector is fully seated — a loose pin creates a voltage drop that mimics a capacity cliff.

Phone stays at 0% and won't power on after the replacement cell sat in storage

Li-ion cells self-discharge in storage. If the cell dropped below roughly 2.5V, the BMS enters lockout to prevent damage and will not pass current to the board. Plug in a known-good charger and leave it connected for 15–20 minutes before pressing the power button — the charge IC needs time to trickle enough voltage into the cell to release the BMS lockout. If the phone still won't respond, check the charger output at the port; you need at least 5V DC reaching the charge IC to trigger recovery.