Can my SPOT Satellite GPS Messenger be plugged in to an external power source?
No. The SPOT Satellite GPS Messenger operates with Energizer 1.5V non-rechargeable size AA lithium batteries. Any other brand of AA lithium will be rechargeable and high voltage, which will damage the unit. These are required due to this technology's unique ability to maintain a high cell volt throughout the life of the battery. Additional benefits are a larger operating temperature range, up to 8 times longer life than alkaline, an outstanding 15-year shelf life and a 30% weight reduction.