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.
This seems like good information to know. It's important to know how long to expect your hearing aids to last. My daughter's had her hearing aids for the past eight years, and they've just started to wear down. It seems like I got a good bang for my buck if the average life span for hearing aids really is five years.