Garmin RINO GPS Alkaline Battery Pack - Bring a spare pack along with you and make sure you've got back-up power when and where you need it! Uses 4AA batteries. Ideal For long hunting or backpacking trips. No need to worry about not being able to charge your RINO's standard battery pack. Just put in 4 AA batteries and your good to go. Compatible Devices: Rino 6xx seriesIncreases battery life to 18 hours