Thinking about ordering a Marco Polo setup. I really don't want another thing to keep charged. Three is enough. The Marco Polo site says. Tag Battery and Charge Capacity† Rechargeable Li•ion battery, included (non-user serviceable) 10 days idle mode 3 days tracking mode 30 days monitor mode Does anyone understand the different modes? Seems idle should be the longest life. I really dont plan on tracking it unless I crash the thing. So what can I expect for battery life on the unit on the Phantom?