24e7d3a5_FAQs___3M_ESPE_Suomi__Possible_Cause
[Problem] The LED showing the operating status in the charger flashes alternately red and green. The handpiece is in the charger. [Solution] Replace the battery. [Possible Cause] 
Malfunction during charging. The battery is damaged.
FAQs - 3M ESPE Suomi
Possible Cause