I have one of these and stupidly left it in the car, so I'm sure it has been working for months. Now the battery is dead. Fortunately. DCRainMaker has all kinds of FAQs about this and most importantly how to turn the back and stick in the CR2032 battery!
The device is designed to run about a year on the user-replaceable battery. And once that year is up, you just turn it over, give it a twist, and pop the battery out and put in a new $3 one from the drugstore: Garmin ANT+ Foot Pods: Everything you ever wanted to know | DC Rainmaker
’ve found again and again that the latest generation of foot pods are incredibly accurate Garmin ANT+ Foot Pods: Everything you ever wanted to know | DC Rainmaker
Does it matter which way I put the foot pod on?
A: As long as it’s not sideways, it won’t matter which way the arrow points. It’s merely there for simplicity’s sake. Garmin ANT+ Foot Pods: Everything you ever wanted to know | DC Rainmaker
Is there any difference between the different non-Garmin foot pods out there?
A: In short, no. The non-Garmin ones are OEM variants of one of the older Garmin versions, so aside from marketing, they’re all the same. The new Garmin ones though are the smallest ones on the market today though, whereas the non-Garmin ones are a bit bulkier. Garmin ANT+ Foot Pods: Everything you ever wanted to know | DC Rainmaker