With care, the Pod should last for multiple pairs of shoes.
There are many Pods still in daily use from our first update in July 2014 – not bad for $29!
When you are ready for new shoes, our first recommendation is always to get a new Pod with a new pair of shoes, alternatively, just “Reset” the Pod (refer to "How to Reset a Pod" for instructions).
As far as the battery, it should last for 4-6 months, depending on amount of use. The Pod “sleeps” when not in use and when the sensor feels motion it wakes up and becomes active, which extends battery life.