I am working on a project and we are using a LiPo 3.7v 500 mAh battery and I want to know how long the battery will last. We are using bluetooth and the circuit is only on for about a millisecond before it goes into sleep mode. The chip transmits at 60 mA and then goes to about 1 micro amp in sleep mode. How can I calculate how long the battery will last? When I try to calculate the time I get an absurd amount of time, like 20 years. How long do LiPo battery's last when sitting Idle?