LG TP5200 Replacement Battery 3.7V 1000mAh Li-ion

LG TP5200 / SCP520 Series — 3.7V Li-ion Replacement Battery (2584-L-141)

This is a 3.7V, 1000mAh Li-ion replacement battery carrying OEM part number 2584-L-141. It fits the LG TP5200, TP5250, DB5250, SCP520, and five additional variants in this family. When the original cell degrades and the phone starts shutting down unexpectedly or no longer holds a charge, this cell replaces it directly.

• TP5200 / SCP520 platform fit: These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol. A battery pulled from one slot works across the group because the charge IC expects the same voltage floor and the same thermistor response on the third pin.
• Bench tested on actual hardware: We cycled this cell through charge, standby, and load discharge on the TP5200 platform. The BMS accepted the cell without fault codes, and the charge IC terminated correctly at 4.2V without overrun.
• Fuel gauge recalibration on first install: On first use after swapping this cell in, disable fast charging and run one full discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.

Why the TP5200 reports wrong battery percentage after a cell swap

The fuel gauge IC on this platform uses a coulomb counter that was calibrated against the original cell's discharge curve. When a new cell goes in, the counter's stored reference points no longer match actual cell behaviour. The phone reads state-of-charge from a curve that no longer applies. One full discharge from 100% down to automatic cutoff, followed by a complete charge, forces the IC to rewrite its reference and report accurate percentages again.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff, not a capacity problem. Under modem transmission or screen backlight load, the cell voltage drops sharply near the lower end of its charge window. The phone's protection circuit reads that drop as an undervoltage event and cuts power before the percentage counter reaches zero. It is most common in the first few cycles on a new cell before the fuel gauge IC has recalibrated. Run two full discharge-charge cycles at standard rate and check whether the cutoff point shifts — if it does not stabilise by cycle three, confirm the charge IC terminated at 4.2V on the last charge.