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      Tips to help you use your personal computer safely

      Customer safety is important to us. Our personal computer products are designed with customer safety in mind, but as with many other electrical devices they are capable of causing physical injuries and property damage, especially if they are not used properly. To reduce these risks, you should read this document carefully and follow the instructions included with your product. By following these instructions and exercising reasonable care, you can help protect yourself and create a safe work environment.

      Department of Transportation Battery Restrictions

      Beginning January 1, 2008 , the U.S. DOT implemented new rules for traveling with lithium-based batteries, which are the type of batteries used in Lenovo notebook PCs today. This document addresses the implications of the new rules to Lenovo products and Lenovo users.

      The generic limitations of this new rule are specified on the DOT web site and have been copied here for your convenience:

      Effective January 1, 2008, the following rules apply to the spare lithium batteries you carry with you in case the battery in a device runs low:

      • Spare batteries are the batteries you carry separately from the devices they power. When batteries are installed in a device, they are not considered spare batteries .
      • You may not pack a spare lithium battery in your checked baggage
      • You may bring spare lithium batteries with you in carry-on baggage – see our spare battery tips and how-to sections to find out how to pack spare batteries safely!
      • Even though we recommend carrying your devices with you in carry-on baggage as well, if you must bring one in checked baggage, you may check it with the batteries installed.

      The following quantity limits apply to both your spare and installed batteries. The limits are expressed in grams of “equivalent lithium content.” 8 grams of equivalent lithium content is approximately 100 watt-hours. 25 grams is approximately 300 watt-hours: “

      All Lenovo batteries shipped either as part of the Lenovo notebook system unit or as a Lenovo option contain less than 8 grams of lithium. The DOT rules below give specific directions based on this classification.

      • Under the new rules, you can bring batteries with up to 8-gram equivalent lithium content. All lithium ion batteries in cell phones are below 8 gram equivalent lithium content. Nearly all laptop computers also are below this quantity threshold.
      • You can also bring up to two spare batteries with an aggregate equivalent lithium content of up to 25 grams, in addition to any batteries that fall below the 8-gram threshold. Examples of two types of lithium ion batteries with equivalent lithium content over 8 grams but below 25 are shown below.
      • For a lithium metal battery, whether installed in a device or carried as a spare, the limit on lithium content is 2 grams of lithium metal per battery.
      • Almost all consumer-type lithium metal batteries are below 2 grams of lithium metal. But if you are unsure, contact the manufacturer!


      Department of Transportation


      Frequently inspect the condition of your computer and its components. Products can become unsafe if they have been damaged, misused, or used in a way that compromises certain safety features (for example, if a power adapter or system unit is exposed to wet conditions or if the insulation on a power cord becomes frayed by the wheels on a desk chair).

      Some conditions are serious enough that the product should not be used again until it has been examined and, if necessary, repaired by an authorized servicer. If you notice any of the following conditions (or if you have other safety concerns), do not use the product. Unplug it from the power source and contact the Support Center or the product manufacturer for instructions.

      Click here for the Support Center telephone number for your location.

      • Frayed, cracked, broken or damaged power cords, plugs, power adapters, extension cords, or surge protectors.
      • A cracking, hissing or popping sound, or a strong odor or smoke coming from the product. It is normal for these conditions to appear when an internal electronic component fails in a safe and controlled manner. However, these conditions may also indicate a potential safety issue. Do not assume it is a safe failure. Turn off the machine, disconnect it from its power source, and contact the Support Center for assistance.
      • Abnormal heat: It is normal for a computer to be warm to the touch, but it should not be uncomfortably warm and the plastic case should not become deformed or discolored by the heat output.
      • Cracks, dents, creases or similar damage to a battery or power adapter.
      • A discharge from the computer, battery or power adapter, or a buildup of foreign substances on these devices.
      • If the product, power cord or power adapter become wet, or if these devices are otherwise exposed to excessive humidity (for example, if liquid is spilled on the product, or if an adapter is left on the floor while it is mopped).
      • The product has been dropped, cracked, dented, otherwise damaged significantly, or electrical connections have become loose.
      • The product does not power-on or shuts down unexpectedly.
      • Other unusual conditions if they cause you to become concerned regarding the product's safety.

      Note: If you notice any of these conditions with a third-party product (such as an extension cord or surge protector), stop using that product until you can contact the product manufacturer for further instructions, or until you obtain a suitable replacement.

      General Safety Guidelines

      For General Safety Guidelines in other languages, please select your preferred language from the list below:

      Brazilian Portuguese French Slovak
      Chinese - Simplified German Spanish
      Chinese - Traditional Italian Turkish
      Czech Japanese  

      Always observe the following precautions to reduce the risk of injury and property damage.


      • Do not attempt to service a product yourself unless instructed to do so by the Support Center. Use only an authorized service provider who is approved to repair your particular product.
      • Some parts can be upgraded or replaced by the customer. These parts are referred to as Customer Replaceable Units, or CRUs. We expressly identify CRUs as such, and provides instructions when it is appropriate for customers to replace those parts. Follow all of our instructions when performing such replacements. Make sure the power is turned off and the product is unplugged from any power source before you attempt the replacement. If you have any questions or concerns, contact the Support Center.

      Click here for the Support Center telephone number for your location

      Power Cords and Power Adapters
      Power adapters typically accompany a portable personal computer, but they may also accompany certain speakers, monitors, printers, and other external peripherals. The following information applies to all such products:

      • Use only the power cords and power adapters approved by the product manufacturer for use with your particular product.
      • Do not wrap a power cord tightly or in other ways that can cause the cord to fray, crack or crimp (for example, wrapping it tightly around the power adapter during storage). ThinkPad power adapters come with a hook and loop fastener designed to hold the cord loosely against the adapter for storage and travel. Unwrap the cords when the adapter is in use.
      • Route power cords so that desk chairs, push carts and other objects do not roll over them, and so that they will not be walked on, tripped over, or pinched by objects.
      • Ensure that power cord connectors are securely plugged into receptacles.
      • Do not use a power adapter or power cord if it shows signs of corrosion, overheating (such as deformed plastic), or other damage. Contact the Support Center for assistance.

      Voltage-selection switch
      Some computers are equipped with a voltage-selection switch located near the power-cord connection point on the computer. If your computer has a voltage-selection switch, ensure that you set the switch to match the voltage available at your electrical outlet. Setting the voltage-selection switch incorrectly can cause permanent damage to the computer. If your computer does not have a voltage-selection switch, your computer is designed to operate only at the voltage provided in the country or region where the computer was originally purchased. If you relocate your computer to another country, be aware of the following: If your computer does not have a voltage-selection switch, do not connect the computer to an electrical outlet until you have verified that the voltage provided is the same as it was in the country or region where the computer was originally purchased. If your computer has a voltage selection switch, do not connect the computer to an electrical outlet until you have verified that the voltage-selection switch is set to match the voltage provided in that country or region. If you are not sure of the voltage provided at your electrical outlet, contact your local electric company or refer to official Web sites or other literature for travelers to the country or region where you are located.

      Extension Cords and Related Devices

      • If you use an extension cord, surge protector, uninterruptible power supply, or a power strip, ensure that it is rated to handle the electrical requirements of the product. You can find information regarding the electrical requirements for your product by looking in your product user guide.
      • Do not overload these devices. If power strips are used, the load should not exceed the power strip input rating. Consult an electrician if you have questions about power loads, power requirements, and input ratings.

      Plugs and Outlets

      • If a receptacle (power outlet) that you intend to use with your computer equipment appears to be corroded or otherwise subjected to high heat stress, do not use the outlet until it is replaced by a qualified electrician.
      • Do not bend or modify the plug. If the plug is damaged, contact the Support Center for information on how to obtain a replacement.
      • Some products are equipped with a three-pronged plug. This plug is designed to fit only into a grounded electrical outlet. This is a safety feature. Do not modify this plug to insert it into a non-grounded outlet. If you cannot insert the plug into the outlet, contact an electrician for an approved outlet adapter or replace the outlet with one that accommodates three-pronged adapters.
      • Do not overload an electrical outlet. The overall system load should not exceed 80 percent of the branch circuit rating. Consult an electrician if you have questions about power loads and branch circuit ratings.
      • Locate your equipment close to a properly wired power outlet. Do not extend power cords in a way that will stress the cords.
      • Connect and disconnect the equipment from the electrical outlet carefully by taking hold of the insulated plug and pulling it in a straight line from the outlet. Do not twist or bend the plug, and do not remove the plug by pulling on the cord.

      Portable personal computers typically include a rechargeable battery pack. Portable and desktop personal computers may also include a coin-sized internal battery that provides power to the system clock when the machine is unplugged. The following information applies to all such batteries.

      • Only use battery packs and charging devices that have been approved by us for use with your particular product.
      • Follow instructions included with your product when charging and operating the battery. · Do not open or service your battery. Contact the Support Center for assistance.
      • Do not crush, puncture, or incinerate the battery pack or short circuit the battery contacts.
      • Do not expose the battery to liquids.
      • Keep the areas around battery compartments, electrical connectors, and device bays clean and free of debris, particularly stray metal.
      • If your battery is damaged, or if you notice a discharge from your battery or the buildup of foreign materials on the battery leads, stop using the battery, obtain an approved replacement, and properly discard the original battery.
      • The rechargeable battery in your portable personal computer will provide better performance and longer life if you cycle the battery periodically. Cycling involves running the laptop on battery mode until the low power alarm on your battery sounds, then promptly recharging the battery to 100%. You should not allow your battery to remain fully discharged for a long period of time (referred to as a "deep discharge").
      • Batteries may experience a deep discharge if they are left unused for a long period of time. This may shorten battery life and increase the risk of a short circuit. Charge batteries periodically, including spare batteries, to avoid potential problems. Recharging batteries to 40% of their capacity at least once every six months is advisable.
      • If your battery will not charge, will not operate very long in battery mode, or if the Battery Health indicator is red (this feature may not be included on your model) you should discontinue using it and obtain a replacement battery. While you may notice a decrease in performance when operating without the battery pack, you may continue to operate the computer using only your AC adapter until you receive your replacement battery. If the replacement battery does not offer improved performance, contact the Support Center for assistance.

      An important note regarding Lithium-Ion batteries:
      When a Lithium-Ion battery overheats or experiences a short circuit, pressure and temperature can increase inside the battery cells. The cells are designed to release pressure and cell materials through vents in the cell can. This design is an important safety feature.

      We have received a number of reports from customers that the Lithium-Ion batteries in their portable computers have overheated and "vented." Some customers reported hearing a hissing, cracking or popping sound immediately before these incidents. Smoke, sparks, and in some instances flames may escape from the battery during these incidents. The battery pack may become extremely hot and the heat may cause the bottom of the portable computer to become deformed. In extreme circumstances, the heat may create a hole in the bottom of the computer. Reports of these types of incidents have not been limited to our products or portable personal computers.

      Users are encouraged to comply with the following instructions and to visit this Web site regularly for the latest information:

      Heat and Product Ventilation
      Computers, AC adapters, and many accessories can generate heat when turned on and when batteries are charging. Always follow these basic precautions:

      • Do not leave your computer, AC adapter, or accessories in contact with your lap or any part of your body for an extended period when the products are functioning or when the battery is charging. Your computer, ACDC adapter, and many accessories produce some heat during normal operation. Extended contact with the body could cause discomfort or, potentially, a skin burn.
      • Do not charge the battery or operate your computer, AC adapter, or accessories near flammable materials or in explosive environments.
      • Ventilation slots, fans,and heat sinks are provided with the product for safety, comfort, and reliable operation. These features might inadvertently become blocked by placing the product on a bed, sofa, carpet, or other flexible surface. Never block, cover, or disable these features.

      Inspect your desktop computer for dust accumulation at least once every three months. Before inspecting your computer, turn off the power and unplug the computer’s power cord from the electrical outlet; then remove any dust from vents and perforations in the bezel. If you notice external dust accumulation, then examine and remove dust from the inside of the computer including heat sink inlet fins, power supply vents, and fans. Always turn off and unplug the computer before opening the cover. If possible, avoid operating your computer within 2 feet of high-traffic areas. If you must operate your computer in or near a high-traffic area, inspect and, if necessary, clean your computer more frequently.

      For your safety and to maintain optimum computer performance, always follow these basic precautions with your desktop computer:

      • Keep the cover closed whenever the computer is plugged in.
      • Regularly inspect the outside of the computer for dust accumulation.
      • Remove dust from vents and any perforations in the bezel. More frequent cleanings might be required for computers in dusty or high-traffic areas.
      • Do not restrict or block any ventilation openings.
      • Do not store or operate your computer inside furniture, as this might increase the risk of overheating.
      • Airflow temperatures into the computer should not exceed 35° C (95° F).
      • Do not use non-desktop air filtration devices.

      CD and DVD drive safety
      CD and DVD drives operate at high speeds. If a CD or DVD is cracked or otherwise physically damaged, the disc may break apart while spinning in the drive. To reduce the risk of injury or damage to your machine, you should:

      • Store CD/DVD discs in their original packaging.
      • Store CD/DVD discs out of direct sunlight and away from heat.
      • Remove CD/DVD discs from the computer when not in use.
      • Do not bend, flex, or carve impressions in CD/DVD discs. Do not force them into the computer or their packaging.
      • Check CD/DVD discs before each use and do not use cracked or damaged discs.

      Electrical safety information
      Danger: Electrical current from power, telephone, and communication cables is hazardous.

      To avoid a shock hazard:

      • To prevent possible shock hazard, do not use your computer during a lightning storm.
      • Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration of this product during an electrical storm.
      • Connect all power cords to a properly wired and grounded electrical outlet.
      • Connect to properly wired outlets any equipment that will be attached to this product.
      • When possible, use one hand only to connect or disconnect signal cables.
      • Never turn on any equipment when there is evidence of fire, water, or structural damage.
      • Disconnect the attached power cords, telecommunications systems, networks, and modems before you open the device covers, unless instructed otherwise in the installation and configuration procedures.
      • Connect and disconnect cables as described in the following table when installing, moving, or opening covers on this product or attached devices.

      To connect:

      1. Turn everything OFF.
      2. First, attach all cables to devices.
      3. Attach signal cables to connectors.
      4. Attach power cords to outlet.
      5. Turn device ON.

      To disconnect:

      1. Turn everything OFF.
      2. First, remove power cords from outlet.
      3. Remove signal cables from connectors.
      4. Remove all cables from devices.
      Limitations of the Sound Pressure Level of Ear-/headphone Output

      Warning note:
      Excessive sound pressure from ear-/headphones can cause hearing damage/hearing loss. Adjustment of the volume control as well as the equalizer to other settings than the center position may increase the ear-/headphones output voltage and therefore the sound pressure level. The use of factors influencing the ear-/headphones output other than those specified by the manufacturer (e.g. operating system, equalizer software, firmware, driver) may increase the ear-/headphones output voltage and therefore the sound pressure level. The use of ear-/headphones other than those specified by the manufacturer may lead to heightened sound pressure level.

      For Limitations of the Sound Pressure Level of Ear-/headphone Output in other languages, please select your preferred language from the list below:

      Arabic Hebrew Simplified Chinese
      Brazilian Portuguese Hungarian Slovak
      Bulgarian Italian Slovenian
      Croatian Japanese Spanish
      Czech Korean Swedish
      Danish Norwegian Thailand
      Dutch Polish Traditional Chinese
      Finnish Portuguese Turkish
      French Romanian Ukranian
      German Russian  
      Greek Serbian Latin  

      California Prop 65 Warning:

      Many Lenovo product packages are labeled with the following warning statement:

      WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

      While this warning may be familiar to residents of California, customers in other geographies may have questions about what this means to them. In order to comply with California’s Proposition 65 warning requirements for exposure to chemicals on the State’s list of over 800 chemicals, Lenovo adds this language to our products’ packaging. Users are advised to consult the product documentation for any unique safety or user instructions for their product, if applicable. For more information on California’s Prop 65 visit https://www.p65warnings.ca.gov/

      Lenovo products continue to meet or exceed all applicable requirements related to safety, environmental, and health as defined by law or Lenovo’s strict standards. Examples of Lenovo products that exceed regulatory requirements are those that comply with UL’s GREENGUARD certification program, which gives assurance that products designed for use in indoor spaces meet strict chemical emissions limits.

      Periodic updates

      Follow and retain the information included with your computer, and refer to this Web site from time to time for the latest information about product safety. The information included in this document supplements, but does not replace, the information included with your computer.

      This information does not alter the terms of your agreement or the Statement of Limited Warranty.


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      • Alias ID: MIGR-45709
      • Document ID: HT036308
      • Last Updated :07 Dec 2016
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