Bluboo X6 Replacement Battery 3.7V 2400mAh Li-ion

Bluboo X6 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 2400mAh Li-ion replacement battery for the Bluboo X6 smartphone. It fits directly into the X6 when the original cell has degraded and no longer holds a usable charge. Voltage and capacity match the stock specification exactly.

• Bluboo X6 fit: The X6 uses a fixed voltage rail at 3.7V with a specific connector orientation and BMS handshake. This cell matches that configuration — no adapter or modification needed.
• Bench tested on actual hardware: We cycled this cell through a full discharge and charge sequence, monitoring BMS cutoff at both ends. The protection circuit tripped correctly at the low-voltage threshold and accepted charge current without fault flags.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. The fuel gauge IC on the X6 is calibrated to the old cell's discharge curve — letting it relearn against the new cell before high-current charging avoids skewed percentage readings from the start.

Sudden shutdown at 20–30% on the Bluboo X6 after a cell swap

This is a voltage cliff issue, not a defective cell. The X6's fuel gauge IC still holds the discharge curve from the old cell in memory. When the modem or display pulls a current spike, the new cell's internal voltage drops below the cutoff threshold before the percentage readout reflects the real state of charge. The phone cuts out because the hardware sees undervoltage even though the software still shows charge remaining. One full discharge-charge cycle with fast charging off forces the coulomb counter to remap against the new cell — after that, shutdowns at 20–30% typically stop.

Phone feels warm near the battery during the first few charges

A new cell arrives with higher internal impedance than a broken-in one. The charge IC on the X6 pushes current into that resistance, and the extra heat is the result — it is not a fault. This normalises after two or three full cycles as the cell's impedance settles. If warmth continues past the third charge or the phone becomes hot to the touch, check that the battery connector is fully seated, as a loose contact forces the charge IC to compensate with higher current draw.