About this replacement
Toshiba Satellite U845W — 7.4V Li-Polymer Replacement Battery (G71C000EH110)
This 7.4V, 7030mAh lithium-polymer cell is a direct replacement for the Toshiba Satellite U845W ultrabook. It fits the U845W's internal battery bay and connects via the original multi-pin connector. Voltage and capacity match the OEM specification: 7.4V, 52.02Wh.
- Satellite U845W fitment: The U845W uses a flat Li-Polymer pack with a specific BMS handshake tied to the G71C000EH110 and PA5065U-1BRS part numbers. This cell carries the same EEPROM data structure the U845W's EC firmware expects on the SMBus line, so the system recognises it without throwing an unknown battery error.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on U845W hardware. The BMS communicated correctly over SMBus, the fuel gauge IC initialised, and charge terminated cleanly at the 8.4V pack ceiling without thermal flags.
- First-cycle calibration on the U845W: After installing, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100%. This forces the U845W's fuel gauge IC to learn the new cell's actual capacity curve and clears the inaccurate health warning that appears in Toshiba's battery utility after every cell swap.
Why the U845W BIOS reports poor battery health after a cell swap
The U845W stores battery health data in EEPROM on the old pack. When you install a new cell, the BIOS reads no prior cycle history and flags the battery as degraded or unknown. This is a data-gap problem, not a fault with the new cell. Running one full discharge-to-hibernate followed by a complete charge lets the firmware write a fresh baseline. After that cycle, the health indicator updates correctly.
U845W shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's voltage curve. The IC maps the old cell's voltage-to-capacity slope onto the new pack, so it calls the battery empty several percentage points early. Under full CPU and display load, the voltage cliff arrives sooner than the gauge predicts. Run two full discharge-to-hibernate and full recharge cycles — after that, the gauge anchors its low-voltage cutoff to the correct point, typically around 6.0V under load.