The QuickCare's battery is good for more than 600 measurements, or approximately 2 years if used once every day.
To extend battery life, try to have your phone nearby when taking readings. The closer your phone, the less energy your QuickCare will use to transmit readings.
If your phone is far away, QuickCare will keep transmitting until your phone is within range, which uses up more energy.
The QuickCare uses one replaceable CR 2032 battery. They're available at all pharmacies, most grocery stores, and online at Amazon.com, Target.com and Walmart.com. They're usually sold in packs of five for around $5.
If you have a choice of brands, we recommend Panasonic or Energizer.