Star C6000 Replacement Battery 3.7V 1000mAh Li-ion

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

This is a 3.7V, 1000mAh Li-ion battery for the Star C6000 and C6000 Wifi smartphones. It slots into the same battery bay as the original and connects via the same contact plate. At 62.00 x 38.00 x 4.50mm, it matches the factory cell's physical footprint exactly.

• C6000 and C6000 Wifi compatibility: Both variants share the same battery bay dimensions, voltage rail, and connector layout, so one cell covers both. The BMS on each model expects a 3.7V nominal cell — this replacement meets that threshold without triggering a handshake error on boot.
• Bench tested on actual hardware: We ran this cell through charge-discharge cycles on a C6000 unit. The BMS accepted the cell cleanly, charge termination triggered correctly at 4.2V, and the protection circuit cut off at the expected low-voltage threshold with no false trips during moderate screen and modem load.
• Fuel gauge recalibration on first use: Disable fast charging for the first full discharge-charge cycle after installation. The fuel gauge IC on the C6000 was calibrated to the original cell's discharge curve. One full uninterrupted cycle lets it remap against the new cell before high-current charging is applied to an uncalibrated coulomb counter.

Why the C6000 reports wrong battery percentage after a cell swap

The C6000 uses a fuel gauge IC that builds its charge model from previous cell behaviour. When you swap in a new cell, the IC still references the old discharge curve, so the percentage it reports will not match actual charge state. This is most visible in the middle range — the phone may read 60% and then stall there for longer than expected, or drop quickly through the upper range. Running one complete discharge down to automatic shutdown and a full charge to 100% without interruption forces the IC to rebuild its curve against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity fault. Under combined modem and display load, the cell voltage drops faster than the fuel gauge predicts, crossing the BMS cutoff threshold while the reported percentage still reads in the 20–30% range. It is more common in the first few cycles before the fuel gauge IC recalibrates. Run two full discharge-charge cycles and check whether the shutdowns persist — if they stop, the IC has corrected its model. If shutdowns continue below 3.2V under load, check the battery contact pins on the device for corrosion or poor spring tension.