The loggers have rechargeable batteries. Each logger comes with a power charger. Please follow the following rules.

• Only official chargers may be used!
• Never replace the batteries with other types
• Make sure you connect the right plug in the logger (see pictures)
• The lights on the bottom of the logger will turn on (constant or blink). Keep the logger charging until both lights switch off

Especially take care to use the correct plug, the charger plug fits into two holes of the logger!