Read this if you have a panasonic toughbook CF-31

original PANASONIC Toughbook CF-31 11.1V 7800mAh laptop battery

• This computer has been designed so as to minimize shock to the LCD and hard disk drive, the leakage of liquid (e.g., water) on to the keyboard, etc., but no warranty is provided against such trouble. Therefore, as a precision instrument, be extremely careful in the handling. 
• Do not drop or hit your computer against solid objects. 
• Do not carry your computer when it is on. 
• Remove all external devices, cables, and PC Cards sticking out of the computer (see the figure on the left) before transporting the computer. 
• We recommend preparing a fully charged panasonic toughbook CF-31 battery (and optional charger, if possible). When transporting spare batteries inside a package, briefcase, etc., it is recommended that the batteries be stored in a plastic bag. check panasonic adapter
• Do not place the computer upright or allow it to tip over. When the computer receives extremely strong shock after falling, the hard disk or floppy disk drive, etc., may become inoperable. 
• Do not carry the computer while the display is open, or carry it by gripping the display. 
• Do not put anything (e.g., a piece of paper) between the display and keyboard. Always carry your computer with you when traveling. 
• Never check it in with luggage. For use of the computer inside an aircraft, we recommend asking the airlines regarding their policy on this issue. 
• It is a good idea to make backup copies on disks and carry them with you. 
• Do not leave a disk in the drive while transporting your computer.

Source from manual.