as a firefighter for over 40 year , I can say the mag-charger be one of the most dependalbe light I have ever use . my original , which I use for 15 year , be lose at a incident scene . I immediately order a new one . I have replace the battery stick only one time . it be mount in my vehicle and be always charge and ready to go . the service time from one charge be more that adequate for most incident . I highly recommend this product .