[. . . ] To ensure proper operation, read this manual thoroughly before using the product. After reading, be sure to keep it where it can be seen by all those who use the product. [. . . ] After reading, be sure to keep it where it can be seen by all those who use the product. wARNING · The EN-EL2 is a rechargeable battery pack for use only with Nikon digital cameras. ⷠWhen recharging the EN-EL2, use only the MH-60 Battery Charger. Do not short the positive and negative battery terminals with a metal object such as a necklace or keys. Failure to follow these instructions could cause the battery to leak corrosive liquids, overheat, or explode. ⷠWhen recharging, the ambient temperature should be between 5­35ºC (41­95ºF). You may notice that the battery is hot directly after use or recharging; this does not indicate a malfunction. ⷠEven when fully charged, the battery will discharge more rapidly in cold conditions. It is recommended that you keep a fully-charged, spare battery on hand. ⷠA marked drop in the time a fully-charged battery retains its charge indicates that the battery needs to be replaced. [. . . ] It is recommended that you keep a fully-charged, spare battery on hand. ⷠA marked drop in the time a fully-charged battery retains its charge indicates that the battery needs to be replaced. [. . . ]