TCL S800 Replacement Battery CAB32E0000C1 3.7V 1650mAh

TCL S800 / S710 Series — 3.7V Li-ion Replacement Battery (CAB32E0000C1)

This is a 3.7V, 1650mAh (6.11Wh) lithium-ion battery for the TCL S800, S710, J160, MW40, and three additional compatible models. It replaces OEM part numbers CAB32E0000C1, CAB32E0002C1, TLiB32E, and TLiB5AF. Fit is confirmed against the original connector and BMS handshake profile for these devices.

• S800 / S710 platform compatibility: These models share the same 3.7V single-cell architecture, connector pinout, and BMS communication protocol — which is why one battery covers the full range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a TCL S800 unit. The BMS accepted the handshake on first connection, charge termination triggered correctly at 4.2V, and the protection circuit tripped as expected under short-circuit conditions.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the TCL S800 reports wrong battery percentage after a cell swap

The S800 uses a fuel gauge IC that builds a discharge curve model over several charge cycles. When you fit a new cell, the IC is still referencing the old cell's degraded curve. This mismatch causes the percentage display to read high or low until the IC relearns. Run two to three full discharge-charge cycles without fast charging — by the third cycle, reported percentage should track closely with actual cell voltage. If it still drifts, check that the battery contacts are clean and seated fully, since a resistive connection skews the coulomb counter readings.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the fuel gauge IC is still calibrated to the old cell and the new cell hits its real voltage floor earlier than the OS expects. Under modem or screen load, cell voltage drops sharply below 3.5V — the BMS trips the output before the OS registers the drop. The phone reads 25% on screen but the cell is already at cutoff voltage. Run a full discharge to shutdown, then charge uninterrupted to 100% — this gives the coulomb counter a fixed reference point and resolves most premature shutdowns.