I hope this makes sense.
Lets say I have a circuit connected to a battery. I want to transfer and hold enough power, before the battery is disconnected, to be able to start my Arduino, turn on a 6V DC motor ( .75a) for 1 second, then wait for 5 seconds and reverse the motor for 1 second.
I was thinking that a capacitor would do the trick, but not sure if that is the best way to do it.
My main concern is cost and size, I did think of having a rechargeable coin cell (if there is such a thing ) but again not sure how long the charging would take, etc.
I am hoping for no more than 1 sec to transfer the power before disconnecting the batter.
Any advice would be great
UPDATE: The device will be in a pipe and not accessible. The battery will actually be charge points which the device will float past.(during which that charge is transfered). The device will the continue flowing down the pipe until a set interval before starting its functions.