TCL A986 Replacement Battery CAB32A0001C1 3.7V 1500mAh

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

This is a 3.7V, 1500mAh Li-ion replacement battery for the TCL A986, S600, A980, and S500 smartphones. It replaces OEM part numbers CAB32A0001C1, TLiB5AB, and CAB1500007C1. Swap this in when the original cell no longer holds a charge or shuts the phone down unexpectedly.

• A986 / S600 / A980 / S500 platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake requirements — 51.61 x 50.72 x 5.24mm with a matching charge IC interface. One cell spec covers the full group.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a TCL A986 unit. The BMS accepted the new cell without triggering a protection cutoff, and the charge IC stepped through trickle, CC, and CV phases cleanly.
• Fuel gauge recalibration on first cycle: Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC in these TCL models calibrates its coulomb counter against the cell's discharge curve — fast charging on an uncalibrated cell pushes current before the IC has a reliable reference baseline.

Why the TCL A986 reports wrong battery percentage after a cell swap

The fuel gauge IC in the A986 stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The IC reads voltage and maps it to the old curve, so the displayed percentage drifts — often reading higher than actual under load. One full discharge down to automatic shutdown, followed by a complete charge to 100%, forces the IC to build a new reference curve against the replacement cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under modem or screen load before the fuel gauge registers a low-battery warning. The A986's processor draws a burst current spike during LTE activity, and a cell with even slight internal resistance sags below the 3.2V hardware cutoff before the OS can gracefully power down. If shutdowns happen consistently around 20–30%, run one full charge cycle without fast charging so the fuel gauge recalibrates its low-voltage threshold. After recalibration, the OS will trigger a shutdown warning accurately before the cell hits 3.2V.