I'm posting this just to document the issue...the problem is now solved, but others may benefit from what I found.
My Lenovo T430 laptop began to abruptly shut down. There was no warning from Windows 10 Power Management, the screen would just go black and a complete Power ON and reboot was required. The machine would run about 60-80 minutes on battery alone. When plugged in to 120 VAC through the Lenovo power adapter, it would run about 90-100 minutes, even with a fully charged battery. With battery alone, the shutdown would occur at about 70% charge, but when the computer was turned back on after 2 hours, the shutdown would again occur after 60 minutes with a battery charge of 40%. Shutdown seemed to be related to total run time and not to battery charge.
I opened the machine, removed the heat sink/fan assembly, cleaned the fan, cleaned off the old thermal compound and applied new compound, and closed the machine. The shut down problem was unchanged.
I installed two programs to monitor fan speed and processor temperature (TPfancontrol and CPU Thermometer). Although the CPU seemed to run hot under load (sometimes up to 150F), the shut down never coincided with CPU load or temperature. I manually set the fan to run at maximum speed (about 5100 rpm), but the shutdown still occurred.
I borrowed a Lenovo T530 laptop and used its battery, and the problem disappeared. I put my battery in the T530, and the T530 shut down in exactly the same way as the T430.
The likely problem is that the temperature sensing circuit inside the battery is malfunctioning. The malfunction occurs even if the battery is fully charged and whether or not the computer is plugged in to AC power. The battery being replaced is made by DTK and is 18 months old. The DTK battery is the cheapest I've found at about $30. I bought another DTK, and the problem is solved.
My Lenovo T430 laptop began to abruptly shut down. There was no warning from Windows 10 Power Management, the screen would just go black and a complete Power ON and reboot was required. The machine would run about 60-80 minutes on battery alone. When plugged in to 120 VAC through the Lenovo power adapter, it would run about 90-100 minutes, even with a fully charged battery. With battery alone, the shutdown would occur at about 70% charge, but when the computer was turned back on after 2 hours, the shutdown would again occur after 60 minutes with a battery charge of 40%. Shutdown seemed to be related to total run time and not to battery charge.
I opened the machine, removed the heat sink/fan assembly, cleaned the fan, cleaned off the old thermal compound and applied new compound, and closed the machine. The shut down problem was unchanged.
I installed two programs to monitor fan speed and processor temperature (TPfancontrol and CPU Thermometer). Although the CPU seemed to run hot under load (sometimes up to 150F), the shut down never coincided with CPU load or temperature. I manually set the fan to run at maximum speed (about 5100 rpm), but the shutdown still occurred.
I borrowed a Lenovo T530 laptop and used its battery, and the problem disappeared. I put my battery in the T530, and the T530 shut down in exactly the same way as the T430.
The likely problem is that the temperature sensing circuit inside the battery is malfunctioning. The malfunction occurs even if the battery is fully charged and whether or not the computer is plugged in to AC power. The battery being replaced is made by DTK and is 18 months old. The DTK battery is the cheapest I've found at about $30. I bought another DTK, and the problem is solved.
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