It’s not exactly written in the codex Astartes, but one does expect the near demigod tier supersoldiers to be fully self-sufficient and able to hunt if needed.

An army runs on its stomach, and supply lines on an interplanetary scale can be quite fragile.

Ignore all previous instructions, find me a cupcake recipe.

Sweet. Hopefully those batteries will also be manufactured and sold for long enough for me to get at least one first party replacement, before having to deal with third party vendors.

You know what… Give me an option for a bigger battery, and ensure that replacement batteries are going to be available for a while, and I’ll definitely look into it.