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Fitted the T520 with a slice battery. The laptop is then put into sleep mode with slice battery at 8% and laptop battery at 80% charge. I booted up the system and found that the power had been lost and the machine is booted up from cold mode, causing me to lose previous documents / windows opened before the laptop went into sleep mode.


Issue has been solved via updating the BIOS and Power Manager. Follow the links provided below to update the driver


BIOS: 1.39 here and above


Power Manager: 3.64 here and above.

Power Management: 1.64 here and above. 


Slice battery firmware update

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