A 30 kg battery that breaks loose in a seaway can short against a hinge, split its case or pull its cables off. E-10 is the standard that keeps it in place.
What it covers
ABYC lists E-10 as Storage Batteries, and its standards development page lists it among standards under review. In our words: how lead-acid batteries are installed on boats, secured, protected from shorting, contained and ventilated.
What surveyors check against it
The movement test. As Steve D'Antonio describes it in Cruising World, each battery must not move more than one inch in any direction under a pull of twice its weight, held for a minute in each direction. D'Antonio thinks that's generous for a seagoing boat and prefers complete immobilisation with a clamp or heavy straps with stainless buckles.
Terminals. Positive terminals protected so a tool can't short them.
Containment and boxes. Flooded batteries need full containment for acid. Boxes aren't required for AGM or gel. A box or tray is fixed from outside, and a closed lid needs a vent at the top for hydrogen.
For lithium, see ABYC E-13. For the fuse at the battery, see ABYC E-11.
Citing it in a finding
"Secure the batteries so they move no more than one inch under a pull of twice their weight, ABYC E-10, and fit covers to the positive terminals." Say how far each battery moved by hand. See unsecured batteries.