During Chapter One of Marvel's Guardians of the Galaxy you will scavenge the remains of a war fleet looking for a monster. You'll eventually set down a bomb called a Thumper that will need a charged battery in order to work. Rocket will ask you to search your surroundings to find one. Here's exactly where to look.
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Guardians of the Galaxy: How to Get a Charged Battery For Rocket
To get a charged battery you will need to search the immediate area around you. It's a fairly small space that doesn't have all that much to look at. Activate your Visor (press RS/R3) and look for brittle material holding up a platform. Check out the screenshot below for exactly where you should be looking.
Shoot at the brittle material until four small cubes fall onto the ground below. You can then use your Visor to look for one that glows yellow.
Scan the yellow battery by holding R2/RT. This will confirm it as being suitable for the Thumper. Now all you need to do is pick it up and take it over to Rocket. He will activate the device, which is used later on in the chapter. Follow Groot and Rocket out of the area to proceed.
That's all you need to know about finding a charged battery for Rocket in Chapter 1 of Guardians of the Galaxy. For more on the game be sure to check our Outfit Locations guide to make sure you haven't missed anything. Elsewhere there's our guide on How to Craft Perks.