The battery looks like the one that will be on the right side where the little briefcase is.
Now as you are looking in each location for your clues, in one of these locations you will find a smaller version of this battery. When you click on it, you will get a 'charging action' and then it will allow you to see the other location that is saying that you need the battery.
Each of the locations that you are searching for clues have the 'possibilitiy' to have a battery however, there is only one for each search game that you are playing. If you run out of time, then the battery will move to one of the other locations.
The place that the battery is in each location will not change. just which location you will need to find it in.
Cheers