2. Polish the terminals with a tissue or dry cloth before charging the battery pack. If the terminals are dirty, for example if there is oil from your skin on the terminals, this may result in poor contact and the battery pack may not charge fully.
Autofocus can fail to achieve focus (the focus confirmation light <> blinks) with certain subjects such as the following: Ensure that the lens and any external sensors on the camera are clean. If necessary they may be cleaned with a soft cloth.
