Star C6000 Replacement Battery 3.7V 1200mAh Li-ion

Star C6000 / C6000 Wifi — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1200mAh Li-ion cell for the Star C6000 and C6000 Wifi smartphones. It replaces the original battery when the existing cell no longer holds a usable charge or fails to power the device at all. Dimensions are 62.00 × 38.00 × 4.50mm — verify against your original cell before installing.

• C6000 and C6000 Wifi compatibility: Both models share the same battery bay dimensions, connector pinout, and 3.7V nominal voltage rail, so one cell covers either variant without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the C6000 platform. The BMS accepted the charge handshake without fault flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This allows the fuel gauge IC to recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

Sudden shutdown at 20–30% on the C6000 after a cell swap

This is a voltage cliff problem, not a capacity problem. Under modem or display load, the new cell's terminal voltage drops faster than the fuel gauge IC expects based on the old cell's discharge curve. The phone interprets the voltage sag as a critical low and shuts down even though coulomb count says 20–30% remains. One full discharge-charge cycle without fast charging lets the fuel gauge IC map the new cell's actual curve and stop triggering premature shutdowns.

Phone warm near the battery during the first few charges

A fresh Li-ion cell has higher internal impedance than a broken-in cell. The charge IC pushes current into that resistance, and some energy dissipates as heat — this is normal for the first two or three charge cycles. Warmth at the back of the phone near the battery bay is expected. If the phone becomes hot to the touch or charging stops before 100%, check that the charge port and cable are not introducing additional resistance.