TCL J210 Replacement Battery 3.7V 1450mAh Li-ion

TCL J210 / J300 / J310 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1450mAh Li-ion cell for the TCL J210, J300, and J310 smartphones. It replaces a degraded or failed original cell and restores the phone to normal operation. Capacity is rated at 5.37Wh and dimensions are 64.15 × 49.98 × 4.20mm — confirm these against your original before installing.

• J210 / J300 / J310 platform fit: These three models share the same battery bay dimensions, voltage rail, and connector pinout. Swapping the same cell across all three works because TCL used a common internal platform for this range — the BMS on each device reads the same charge termination signals.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS accepted charge termination at the correct cutoff voltage and showed no unexpected protection trips during the discharge curve.
• Fuel gauge recalibration tip: On first use after installation, run one complete discharge-to-charge cycle with fast charging disabled. The fuel gauge IC in these TCL models calibrated itself against the old cell's discharge curve — giving it one slow, full cycle lets it remap to the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the TCL J210 after a cell swap

The TCL J210's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that curve no longer matches the actual voltage drop profile of the replacement. Under load — mobile data, GPS, or screen at full brightness — the phone sees a sharp voltage sag the IC didn't predict, and the protection circuit cuts power before the displayed percentage reaches zero. This is not a defective cell. One full discharge-charge cycle at standard charge rate gives the coulomb counter enough data to recalibrate. After that cycle, the shutdowns stop.

Phone feels warm near the battery during the first few charges

A new cell starts with slightly higher internal impedance than a conditioned one. The charge IC on the J210 and J300 pushes current at its normal rate regardless, which generates more heat across a higher-resistance cell. This is expected on cycles one through three and settles as the cell conditions. If the back of the phone is too hot to hold comfortably or charging stops and restarts repeatedly, disconnect and let the phone cool to room temperature before resuming — then check that the charge voltage at the connector reads between 4.1V and 4.2V at termination.