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    The best I've seen on Arduino power consumption: gammon.com.au/power You can get the ATmega current draw down to 100 nA in "power down sleep mode"; the rest depends on the other parts of your circuit and what percentage of the time you can stay asleep. You may want to rethink your LED: If you light a 20 mA LED for five seconds out of every 10 seconds, 50% "on" time, the LED alone will drain 500 mAh in 50 hours. The guy in the link found that flashing a LED for 5-10ms once a second was enough to make it visible. Commented Jan 21, 2015 at 15:51
  • It's worth checking if you may do better with an nrf51822 which is a combination processor & BLE, and no ATmega. Commented Jan 21, 2015 at 17:22
  • One year = 8765 hours. So average drain for 1 year life from 500 mAh = 500 mAh/8765h = 57 uA average. | An efficient modern LED is usefully bright at 1 mA and probably at 0.1 mA. [Best LEDs are 30 Cd+ at 20 mA so 150 mCd mean at 0.1 mA and your eye-brain sees more like the peak. | 0.1 mA at 1% duty cycle for one year = 8765 x 0.1 x 1/100 = 8.765 mAh or about 2% of your battery capacity. Commented Jan 28, 2015 at 13:29