TCL A986 Replacement Battery 3.7V 1650mAh CAB32A0001C1

TCL A986 / S600 / A980 / S500 — 3.7V Li-ion Replacement Battery (CAB32A0001C1)

This is a 3.7V, 1650mAh (6.11Wh) lithium-ion replacement battery for TCL smartphones including the A986, S600, A980, and S500. It uses OEM part numbers CAB32A0001C1, TLiB5AB, and CAB1500007C1. Swap it in when the original cell no longer holds charge or the phone shuts down unexpectedly under load.

• A986, S600, A980, S500 compatibility: These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake requirements. One cell fits all four because the charge IC and fuel gauge IC communicate over the same protocol across this TCL platform.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the TCL platform, confirmed BMS negotiation completed without fault codes, and verified the fuel gauge IC accepted the new cell's discharge curve without triggering a protection cutoff.
• First-cycle fast charge caution: 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 A986 reports wrong battery percentage after a cell swap

The fuel gauge IC on these TCL devices uses a coulomb counter that was calibrated to the original cell's specific discharge curve. When you install a new cell, that learned curve no longer matches the new cell's actual voltage-versus-capacity relationship. The result is percentage readings that can be off by 10–20%, with the phone sometimes jumping from 30% to shutdown without warning. One full discharge cycle down to auto-off followed by a full charge to 100% forces the IC to rebuild its reference curve against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity problem. Under peak load — active LTE, screen at full brightness, or a background sync burst — the cell voltage drops sharply below the protection threshold even when the reported percentage looks healthy. The BMS trips to protect the cell and the phone cuts off instantly. If this happens consistently around 20–30%, run one full calibration cycle as described above, then check that shutdown voltage stabilises at or above 3.2V under normal screen-on load.