[. . . ] Only use an extension cable that is approved and technically in perfect condition. Malfunction during charging can be caused by storing and operating in places where the temperature exceeds +40°C; this should be avoided. Battery charging in closed cupboards, near heat sources (radiators, bright sunshine) etc. [. . . ] n Make sure the latches on each side of the battery pack snap into place and the battery pack is secured in the charger before beginning operation. n Place the battery pack in the charger aligning the raised rib on the battery pack with the groove in the charger. n Press down on the battery pack to be sure contacts on the battery pack engage properly with contacts in the charger. Note: After charging is complete, the green LED will remain on until the battery pack is removed from the charger or charger is disconnected from the power supply. n The battery pack will become slightly warm to the touch while charging. This is normal and does not indicate a problem. OPERATION WARNING Do not allow familiarity with products to make you careless. Remember that a careless fraction of a second is sufficient to inflict serious injury. WARNING Always wear safety goggles or safety glasses with side shields when operating products. Failure to do so could result in objects being thrown into your eyes, resulting in possible serious injury. WARNING Do not use any attachments or accessories not recommended by the manufacturer of this product. The use of attachments or accessories not recommended can result in serious personal injury. APPLICATIONS You may use this product for the following purposes: n Charging and maintaining Ryobi One+ 18V battery packs at peak charge every time (not over time). CAUTION: If at any point during the charging process none of the LEDs are lit, remove the battery pack from the charger to avoid damaging the product. Return the charger and battery to your nearest service center for service or replacement. 2 English OPERATION n Do not place the charger and battery pack in an area of extreme heat or cold. Note: The charger and battery pack should be placed in a location where the temperature is more than 10°C but less than 38°C. n When batteries become fully charged, it is suggested to unplug the charger from the power supply and remove the battery pack. [. . . ] Ensure no metal filings or swarf can fall into the vents during storage, as this may cause serious injury when it is next used. LED shows a slow pulse - batteries are in maintenance mode. 100% 0% WAVE PULSE LED produces fluctuating pulse ­ charger is in energy save mode. n When batteries are charging, the blue LED status button will maintain a full and constant brightness. n While batteries are in maintenance mode, the blue LED status button will slowly pulse. [. . . ]