It indicates that the SB900 battery has been placed in the charger incorrectly. The battery is positioned "backwards." That is, the label is still facing up but the orientation has been reversed for the positive and negative ends.
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It indicates that the SB900 battery has been placed in the charger incorrectly. The battery is positioned "backwards." That is, the label is still facing up but the orientation has been reversed for the positive and negative ends.