Baidu Cloud V5 Replacement Battery 3.8V 2200mAh 100B

Baidu Cloud V5 Series — 3.8V Li-ion Replacement Battery (100B)

This is a 3.8V, 2200mAh Li-ion cell replacing part number 100B in the Baidu Cloud V5 and V5100B smartphones. It restores power to a phone that shuts down early, won't hold charge, or won't turn on at all. Capacity figure comes directly from the product specification — 8.36Wh total energy.

• V5 and V5100B platform fit: Both models use the same 100B cell footprint, voltage rail, and connector pinout. The BMS handshake and charge IC logic are identical across this variant, so a single cell serves both without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a V5 unit. The BMS accepted charge from the phone's onboard charge IC without fault flags, and voltage held stable across screen-on and modem-active load states.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This gives the fuel gauge IC a clean reference against the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC is still reading the old cell's discharge curve after a swap. The phone calculates remaining charge based on voltage thresholds mapped to the worn cell — not the new one. When the new cell hits a voltage point the IC interprets as critical, it triggers an emergency shutdown even though usable charge remains. One full discharge to near-zero followed by a complete charge cycle resets the coulomb counter reference — after that, the percentage reading tracks the actual cell state correctly.

Device not powering on after the replacement sat in storage

If the battery self-discharged below approximately 2.5V during storage, the BMS enters lockout mode to prevent cell damage from deep discharge. The phone will show no response on the charge cable and no boot screen. Connect to a wall charger — not a PC USB port — and leave it for 15–20 minutes without pressing the power button. The charge IC on the phone needs to trickle current into the cell long enough for the BMS to register a safe voltage threshold and release the lockout before normal charging resumes.