Nikon D7000 - Manual (Page 311)

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• Charge the battery before use. When taking photographs on important occasions, ready a
spare EN-EL15 battery and keep it fully charged. Depending on your location, it may be
difficult to purchase replacement batteries on short notice. Note that on cold days, the
capacity of batteries tends to decrease. Be sure the battery is fully charged before taking
photographs outside in cold weather. Keep a spare battery in a warm place and exchange
the two as necessary. Once warmed, a cold battery may recover some of its charge.
• Used batteries are a valuable resource; recycle in accord with local regulations.