Here's a brief description of the Guardian and Pet modules' batteries:
- Real-time GPS tracking: up to 12 hours of continuous tracking
- Activity tracking only: up to 5 days (launching soon)
- Rechargeable batteries
- Full charge: 2 hours - blinking red: charging / blinking green: charged
- The USB charger on each Findster Duo kit charges up to 3 modules at once
Please note that the battery life depends on several factors (like the proximity between the modules, for example). Regarding continuous GPS tracking, an estimate would be 12 hours of battery life. Since Findster Duo allows real-time GPS tracking (which is key to the devices' purpose and usefulness), it produces more positional updates than every other GPS tracking device available, and consequently the modules' battery will also drain faster than other devices which produce less (and less accurate) positional updates.