A:Answer The vívoactive uses a rechargeable Lithium-Ion battery. You're correct, it's difficult to predict the lifetime of a rechargeable battery, as this can be affected by so many factors.
Rechargeable Lithium-ion (Li-ion) batteries will naturally lose some capacity over time, due to charge/discharge cycling.
All batteries in devices made by Garmin utilizing Li-ion batteries will share this characteristic. Under normal operating conditions, the batteries in these devices should have approximately 80% of their original capacity after a few years of frequent charge/discharge cycles.
There are several factors that can accelerate the normal degradation of battery capacity including:
* Exposure to high temperatures
* Leaving the battery completely charged or discharged for long periods of time (anything longer than two weeks.)
When storing the device long-term, it is recommended to partially charge the device (approximately 30 to 50%) and keep it in a cool, dry place. Some devices may require a full charge and discharge cycle before an accurate measure of battery capacity can be made.
The vívoactive battery is not user replaceable. If a new battery is needed, it can be replaced by utilizing the Garmin RMA process or contacting your local Garmin support office at www.garmin.com/support.
I hope this helps. Thank you! *CG