Nikon Df - Manual (Page 358)

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• Continuing to charge the battery after it is fully charged can impair
battery performance.
• A marked drop in the time a fully charged battery retains its charge
when used at room temperature indicates that it requires replacement.
Purchase a new battery.
• Charge the battery before use. When taking photographs on important
occasions, ready a spare 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.