RYOBI OP40204 40V 2Ah Lithium-Ion Compact Battery



WARNING: READ AND UNDERSTAND ALL INSTRUCTIONS. Failure to follow all instructions listed below may result in electric shock, fire, and/or serious personal injury

  • Battery tools do not have to be plugged into an electrical outlet; therefore, they are always in operating condition. Be aware of possible hazards when not using your battery tool or when changing Following this rule will reduce the risk of electric shock, fire, or serious personal injury.
  • Do not place battery tools or their batteries near fire This will reduce the risk of explosion and possibly injury.
  • Do not crush, drop or damage the battery pack. Do not use a battery pack or charger that has been dropped or received a sharp A damaged battery is subject to explosion. Properly dispose of a dropped or damaged battery immediately.
  • Batteries can explode in the presence of a source of ignition, such as a pilot light. To reduce the risk of serious personal injury, never use any cordless product in the presence of an open flame. An exploded battery can propel debris and If exposed, flush with water immediately.
  • Do not charge the battery tool in a damp or wet location.
  • Following this rule will reduce the risk of electric shock.
  • Do not store or charge battery packs in locations where the temperature is less than 50°F or more than 100°F. Do not store outside or in
  • Charge only with an RYOBI 40 V lithium-ion battery Use of other chargers may result in personal injury, fire, or damage.
  • n Do not charge the battery in an area of extreme heat or cold. It will work best at normal room temperature.
  • Under extreme usage or temperature conditions, battery leakage may If liquid comes in contact with your skin, wash immediately with soap and water. If liquid gets into your eyes, flush them with clean water for at least 10 minutes, then seek immediate medical attention. Following this rule will reduce the risk of serious personal injury.
  • When the battery pack is not in use, keep it away from other metal objects like paper clips, coins, keys, nails, screws, or other small metal objects that can make a connection from one terminal Shorting the battery terminals together may cause sparks, burns, or fire and can lead to personal injury or property damage.
  • Always remove the battery pack from your tool when you are assembling parts, making adjustments, cleaning, or when not in use. Removing the battery pack will prevent accidental starting that could cause serious personal injury.
  • Always remove the battery pack before storing the device.
  • When the battery becomes fully charged, unplug the charger from the power supply and remove the battery pack from the
  • Always wear eye protection with side shields marked to comply with ANSI 1. Failure to do so could result in objects being thrown into your eyes and other possible serious injuries.
  • Keep the battery pack dry, clean, and free from oil and grease. Always use a clean cloth when cleaning. Never use brake fluids, gasoline, petroleum-based products, or any solvents to clean the battery
  • Do not use a battery pack that is damaged or Damaged or modified batteries may exhibit unpredictable behavior resulting in fire, explosion, or risk of injury.
  • n Do not modify or attempt to repair a battery pack that has been damaged.
  • Do not expose a battery pack or appliance to fire excessively Exposure to fire or temperature above 265°F (130°C) may cause an explosion.
  • Have servicing performed by a qualified repair person using only identical replacement This will ensure that the safety of the product is maintained.
  • Disconnect the battery pack from the appliance be- fore making any adjustments, changing accessories, or storing appliances. Such preventive safety measures reduce the risk of starting the appliance
  • Note: This warning is not applicable for batteries that cannot be disconnected from the appliance in normal use.
  • Recharge only with the charger specified by the A charger that is suitable for one type of battery pack may create a risk of fire when used with another battery pack.
  • Follow all charging instructions and do not charge the battery pack or appliance outside of the temperature range specified in the Charging improperly or at temperatures outside of the specified range may damage the battery and increase the risk of fire.
  • Save these instructions. Refer to them frequently and use them to instruct others who may use this tool. If you loan someone this tool, loan them these instructions also.


Lithium-ion batteries deliver fade-free power for their entire run time. Lithium-ion tools will not gradually lose power due to decreasing battery charge. Instead, power from the battery pack will drop from full to zero once the full charge has been drained from the battery. Once this happens, recharging of the battery is required. It is not necessary to drain the battery pack completely before recharging.

Lithium-ion battery packs are designed with features that protect the lithium-ion cells and maximize battery life. If the tool stops during use, release the trigger to reset and resume operation. If the tool still does not work, the battery needs to be recharged.

The lithium-ion battery pack can be used in temperatures down to –4°F. Put the battery pack on a tool and use the tool in a light-duty application. After about a minute, the pack will warm up and begin operating normally.

To display the amount of charge left in the battery, press the charge level indicator button. In the event of an error in discharge, the LEDs will flash the error code for at least 5 seconds


Battery packs are shipped in a low-charge condition to prevent possible problems. Therefore, you should charge prior to first use. If the charger does not charge the battery pack under normal circumstances, return both the battery pack and charger to your nearest Authorized Service Center for an electrical check.

  • Charge the battery pack only with the recommended charger.
  • Refer to the charger operator’s manual for charging instructions.

When using a tool continuously, the battery pack may become hot. A hot battery pack may be placed directly onto the charger port but charging will not begin until the battery temperature cools to within an acceptable temperature range When a hot battery pack is placed on the charger, the charger may indicate the pack is not ready to charge. Please refer to the charger operator’s manual. When the battery pack cools the charger will automatically begin charging.

A cold battery pack may be placed directly onto the charger port but charging will not begin until the battery temperature warms to within an acceptable temperature range. When a cold battery pack is placed on the charger, the charger may indicate the pack is not ready to charge. Please refer to the charger operator’s manual. When the battery pack warms to approximately room temperature the charger will automatically begin charging.


These batteries have been designed to provide maximum trouble-free life. However, like all batteries, they will eventually wear out. Do not disassemble the battery pack and attempt to replace the batteries. Handling these batteries, especially when wearing rings and jewelry, could result in a serious burn.
To obtain the longest possible battery life, we suggest the following:

  • Remove the battery pack from the charger once it is fully charged and ready for use.

For battery pack storage longer than 30 days:

  • Store the battery pack where the temperature is below 80°F and away from moisture.
  • Store battery packs in a 30%-50% charged condition.
  • Every six months of storage, charge the pack as normal.
  • To preserve natural resources, please recycle or dispose of batteries properly.
  • This product contains lithium-ion batteries. Local, state or federal laws may prohibit the disposal of lithium-ion batteries in ordinary trash.
  • Consult your local waste authority for information regarding available recycling and/or disposal options

Upon removal, cover the battery pack’s terminals with heavy-duty adhesive tape. Do not attempt to destroy or disassemble the battery pack or remove any of its components. Lithium-ion batteries must be recycled or disposed of properly. Also, never touch both terminals with metal objects and/or body parts as a short circuit may result. Keep away from children. Failure to comply with these warnings could result in fire and/or serious injury.


  • This product has a three-year limited warranty. For warranty details go to www.ryobitools.com.

Documents / Resources

RYOBI OP40204 40V 2Ah Lithium-Ion Compact Battery [pdf] User Manual
OP40204, OP40404, OP40504, OP40604, 40V 2Ah Lithium-Ion Compact Battery, Lithium-Ion Compact Battery, Compact Battery, OP40204, Battery


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