How long does the pedometer battery last before it needs replacing?

On average most people will find the battery will last for a year, but it will vary depending on how much you use the pedometer.
The pedometer does have an auto sleep function which helps to conserve battery power, so if you have not moved for a few minutes it will go into sleep mode automatically and as soon as you start moving it will wake up again and continue counting your steps for the day.
When you need to replace the battery it is easy to do by removing the cover on the back of the pedometer using a small philips screwdriver and replacing with a CR-2032 flat cell battery. - There are many sellers on Amazon selling that battery type.