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.
Hi Carol, It really depends on the hearing aid- but 4 days for 312 batteries is an exceptionally short period of time. Also, while a 312 battery may last up to 15 days, 10-12 days is more realistic. You might have your hearing aids checked for excessive battery drain, itâs not an uncommon problem.