Fujitsu TeamPad PBT7500-16 Operation Manual page 27

NOTE
If the LED of the dual battery pack charger flashes red, verify that the battery(s) is
connected securely inside the pack charger. If the battery(s) is connected correctly and the
LED is still flashing red, than that indicates a problem with the battery or the battery has
reached the end of its life cycle. Replace the battery(s) with a new one.
14