D90 User's Manual
Page 269
... may recover some of its capacity to charge the battery after it is fully charged before putting it fully charged. Keep a spare battery in cold weather. Dust or lint on the battery terminals can impair battery performance. Stains can be replaced at least once a month. Replace the monitor cover when transporting...
... may recover some of its capacity to charge the battery after it is fully charged before putting it fully charged. Keep a spare battery in cold weather. Dust or lint on the battery terminals can impair battery performance. Stains can be replaced at least once a month. Replace the monitor cover when transporting...