The BACtrack C6 breathalyzer runs on a CR2032 coin cell battery, which is replaceable. According to our research, while the specific battery life isn't mentioned by the manufacturer, these types of batteries generally last for several months with typical use before you'll need to swap them out.
The C6 offers a couple of ways to check your results: Standalone Mode, where you see your BAC directly on the device, and App Mode. The latter lets you send the results to your smartphone via Bluetooth for a more detailed look at your drinking patterns.
It's compatible with both Apple and Android phones, and Apple users can even sync it with Apple HealthKit to keep track of their BAC over time.
We've found that while many folks like these features, there are occasional reports of minor hiccups when connecting to a phone, especially in App Mode. Sometimes people notice short delays when pairing the device.
If you decide to go with the BACtrack C6, it's a good idea to keep an extra CR2032 battery around, just so you're not caught off guard if the battery runs out unexpectedly.
Overall, it seems like a decent pick if you want to keep an eye on your BAC using your smartphone.
How we researched this
Where this comes from: This answer is based on ShopSavvy's product database, real-time pricing from 3 retailers, and a look at hundreds of user reviews to give you a well-rounded picture.
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