For extended outings with your Oregon 600 series or GPSMAP 64 series, bring an extra NiMH battery pack, or purchase this as a replacement. This battery pack triggers the charging capability of the Oregon 600/GPSMAP 64 series.
NiMH battery pack can be charged by the GPS - simply charge your device using your own AC Adapter or USB cable on your computer and your battery pack will be back to full charge for extended use.