Days in Inventory. The formula to calculate days in inventory is the number of days in the period divided by the inventory turnover ratio. This formula is used to determine how quickly a company is converting their inventory into sales.
How long do hearing aid batteries typically last? A standard hearing aid battery lasts anywhere from 3 to 22 days, depending on the hearing aid type, battery type and capacity, and the amount of hearing aid use. How do I know if I should change batteries? Change your batteries if sounds become distorted or you have to turn up the volume more than usual.
The company says that the style of hearing aid, as well as how often you wear them are amongst the factors that will determine the lifespan of Unitron hearing aids. However, they quote four to five years as being the standard time period that most people will look to replace their hearing aids with a new set.