About this replacement
Acer TravelMate 372TMi Series — 14.8V Li-ion Replacement Battery (BTP-50T3)
This 14.8V, 1800mAh (26.64Wh) Li-ion cell replaces the original BTP-50T3 battery in the Acer TravelMate 372TMi, 372TCi, 372LMi, 371TCi, and over 25 related TravelMate models. It slots into the same battery bay with the same connector pinout and BMS communication protocol as the factory unit. Voltage and capacity match the original specification exactly.
- TravelMate 37x compatibility: The 372TMi, 372TCi, 372LMi, and 371TCi all share the same 14.8V four-cell architecture, identical connector keying, and the same BMS data line — so one cell works across the full sub-series without modification.
- Bench tested on actual hardware: We ran this cell in a TravelMate 372TMi chassis and confirmed the BMS handshake completed on first boot, charge acceptance started within 90 seconds of connecting AC, and the BIOS battery status screen populated without error flags.
- First-cycle conditioning on the TravelMate 37x: After installation, run the laptop on battery until it hibernates at the low-voltage cutoff — then charge uninterrupted to 100%. This forces the TravelMate's BIOS battery learn cycle to complete against the new cell and clears the "poor health" or "unknown battery" flag that appears after every cell swap on this platform.
Why the TravelMate 372TMi shuts down at 20–30% battery remaining
The TravelMate 37x platform reads cell voltage and compares it against a discharge curve stored during the learn cycle. When the CPU and display both draw full load, a worn or uncalibrated cell hits a voltage cliff — it drops faster than the stored curve predicts. The BIOS interprets this as an imminent cutoff and triggers an emergency shutdown even though the fuel gauge still shows charge remaining. Running one full discharge-to-hibernate cycle after installation recalibrates that curve against the new cell's actual voltage behaviour.
BIOS reporting the BTP-50T3 replacement as "poor health" or 0% on first boot
The TravelMate BIOS stores battery health data in EEPROM on the old cell — when you swap to a new cell, that EEPROM data is gone and the firmware defaults to a worst-case reading. This is not a fault with the replacement cell. To clear it, complete one full discharge to hibernate-cutoff followed by a full uninterrupted charge to 100%. After that cycle, the BIOS rewrites the EEPROM baseline against the new cell and the health indicator updates to reflect actual capacity.