Circuit flaw - Holosun Rail Mounted Laser Sight

Something drains the battery while laser is off. A circuit flaw of some sort that is parasitic to the power supply. The battery is accessible while installed but you need to pull battery while stored. Otherwise I really like this physical design and laser. It is bright green and solid body and compact. The solid body gives it rigidity and a stable beam after use. But you need to pull the battery out after use. This negates EDC use except for planned range use to ensure light is available. Sad, but I like it for range.