Good sharp photos of all faces are good, but the "gold standard" for documenting your battery is to place it on a flat bed scanner and scan each face.
Place a ruler and a strip of bright white paper within the field of view of your camera.

This permits correction for color balance and shows true scale of the image.

Place your camera on a solid surface with the lens perpendicular to the center of the battery face.
Do not use flash in a simple setup like this.
Work in an area with bright diffuse light.
This is the type of image you will get with this setup.
Photograph every face even if it appears blank that includes the bottom as well.
These images can give information on how the paper or card stock is cut & glued together.
The very best way to document batteries is to place them on a flat bed scanner.

Wipe the battery with a soft cloth to remove any grit.  Carefully place on the glass.  You should have no problem with batteries up to 6 or 7 kg.

If you are worried about the weight.  Simply turn the scanner upside down and lay on the top of the battery!

Again, lay a scale and a bright white strip of paper so that they are within the field of view.

Scan at 300 or 600 d.p.i. and save as a .jpg or .pdf.
Whether you use a camera or scanner, take these two isometric views so that the side panels can be placed in their proper order.
Add text to your image to give the the measured Width, Depth & Height of sides.
If you cannot scan the top because of connectors, photograph just like the setup at the top of the page.  If reflections are a problem, shoot slightly off-axis like this.
To photograph:
Even if your battery is in very bad condition, the images can still be of real value.  They may pair with images from another damaged artifact.

Persons with access to advanced photo editors usually do not just retouch images.  Instead, these images serve as reference templates for new layers of text and other graphical features that can be placed with precision thanks to your images.
EVEN BAD EXAMPLES HELP !
Send images to kd4hsh@carolina.rr.com and I will post them.

SCAN ADVERTISEMENTS, BROCHURES AND CATALOG PAGES IF YOU HAVE THEM