TLiS600 TCL P728M Replacement Battery 3.8V 3300mAh

TCL P728M Series — 3.8V Li-Polymer Replacement Battery (TLiS600)

The TLiS600 is a 3.8V, 3300mAh Li-Polymer cell that fits the TCL P728M, 3N, I718M, and M2U smartphones. It replaces a degraded original cell that can no longer hold a usable charge across a full day. Capacity figures come from our product data — 12.54Wh nominal.

• P728M platform compatibility: The P728M, 3N, I718M, and M2U share the same battery bay dimensions, connector pinout, and BMS handshake protocol — which is why a single TLiS600 cell covers all of them. Swapping between these models does not require firmware or hardware changes on the charge IC.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a P728M unit. The BMS accepted the cell without fault flags, balanced current draw held stable under simultaneous LTE and display load, and the charge IC reached cutoff voltage cleanly at 4.35V.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard current. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging begins on an uncalibrated reference.

Sudden shutdown at 20–30% on the replacement cell

This happens because the fuel gauge IC is still using the discharge curve it learned from the old, degraded cell. When a new cell hits a voltage region the old curve said was safe, the IC underestimates how fast voltage will drop under modem or display load. The phone's protection circuit sees the voltage cliff and shuts down before the reported percentage reaches zero. One full discharge-charge cycle at standard current retrains the coulomb counter and eliminates the early cutoff.

USB fast charge not activating after a cell swap

After installing a new cell, some TCL charge ICs run an initial handshake check before accepting the USB-PD or proprietary fast-charge protocol. If the BMS on the new cell has not yet completed its first full charge cycle, the IC may default to 5V standard charging as a safety measure. Plug in, let it charge fully at standard rate, then unplug and reconnect — the fast-charge negotiation should complete normally on the second connection. If it still does not trigger, confirm the charger output matches the phone's rated input voltage of 5V/9V.