TCL A990 Replacement Battery CAB31P0000C1 3.7V 1300mAh

TCL A990 / C990 Series — 3.7V Li-ion Replacement Battery (CAB31P0000C1)

This is a 3.7V, 1300mAh Li-ion cell that replaces the original battery in the TCL A990, C990, A919, and A966 smartphones. It matches the OEM part numbers CAB31P0000C1, CAB31P0001C1, and TB-4T0058200. Physical dimensions are 64.30 × 49.50 × 4.50mm — verify against your existing cell before installation.

• A990 / C990 / A919 / A966 platform fit: These models share a common PCB layout and battery connector pinout. The BMS handshake uses the same voltage thresholds across the series, so one cell covers all listed variants without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the A990 platform. The BMS accepted the cell without error flags, charge termination triggered correctly at 4.2V, and low-voltage cutoff engaged at the expected floor.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle before enabling it again. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes into an uncalibrated register.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC still references the old cell's discharge curve. When the new cell hits a voltage cliff under modem or screen load, the phone shuts down even though the reported percentage looks safe. The fix is one full uninterrupted discharge cycle — drain to automatic shutdown, then charge to 100% without interruption. After that cycle, the coulomb counter re-anchors to the new cell's actual capacity and the shutdowns stop.

Phone won't power on after the battery sat discharged in storage

If the cell voltage dropped below roughly 2.5V during storage, the BMS enters lockout to prevent damage. Plugging in USB at that point may show no response for several minutes — this is normal. Leave it connected to a wall charger, not a PC port, for at least 20–30 minutes. Once the BMS sees enough voltage to exit lockout, it will begin accepting charge current and the screen will respond.