User manual NIKON MH-22

[. . . ] Calibration Calibration allows precise measurement of battery charge, ensuring that the battery level can be displayed more accurately. EN-EL4/EN-EL4a Rechargeable Li-ion Batteries EN-EL4/EN-EL4a rechargeable Li-ion batteries can transmit information on battery state when connected to compatible devices. [. . . ] Do not attempt to recharge any other batteries with the MH-22. Do not use this product with non-compatible batteries. ⷠUnplug the power cable from the power outlet when not in use. ⷠYoung children should be supervised to ensure that they do not play with the appliance. Precautions for Use: Nikon EN-EL4/EN-EL4a Rechargeable Li-ion Batteries IMPORTANT The internal temperature of the battery may rise while the battery is in use, especially when the ambient temperature is high. If you attempt to recharge the battery while the internal temperature is elevated, the battery will not charge or will charge only partially. The battery may also not function properly. Wait for the battery to cool before charging. When recharging the battery, the ambient temperature should be between 0 to 40 °C (32 to 104 °F) or the battery may not fully charge or may not function properly. Should you notice smoke or an unusual smell coming from the charger, unplug it, taking care to avoid burns. Insert the battery (terminals first), aligning the end of the battery with the guide and then sliding the battery in the direction indicated until it clicks into place (Figure 2-b). The Charge and Calibration Lamps There is one set of charge lamps, while each chamber has its own chamber and calibration lamps and calibration button. [. . . ] When the charger is not in use, replace the contact protectors to prevent dust from accumulating on the charger contacts. Battery Warning If the chamber and calibration lamps flash on and off in sequence when no battery is inserted, there is a problem with the charger. [. . . ]