Hoppers and pipes

In one line. Without lithium, a hopper fills a slot up to the crate's capacity. With lithium, it stops at 64, because the opposite would destroy the items. The player's own hand is affected in neither case.

What the mod changes about a hopper

A vanilla hopper stops at what an ordinary stack accepts, so 64, whatever the target container can hold. DeepCrate corrects that for its own crates, and it is the only part of the mod that depends on what is installed beside it.

An iron crate screen whose first slot holds 96 dirt blocks, a 512 module on the tab. — A hopper pushed dirt past the 64 already there. The slot holds 96.

Why lithium turns it off

Lithium replaces the hopper entirely and keeps its own copy of the target inventory. Against a container answering more than 64, it takes the items out of the hopper and never writes them into the crate: they vanish.

The number was measured rather than assumed, eight dirt blocks destroyed per pass, with or without the fix. The mod therefore chooses to keep the items and lose the feature: as long as lithium is installed, a crate reports 64 per slot to automation.

Taking the decision back

A server owner can set limitAutomationWithLithium to false in config/oas/deepcrate.json. Filling past 64 comes back, and the items are lost, knowingly.

A hopper against a pair

A hopper placed against a double crate only reaches the half it touches, as with a barrel. Joining the two halves is what the game does for an ordinary chest, but lithium recasts that result and the server falls over on the first tick.