How to sell lithium batteries?

You have to wait until someone wants to buy lithium batteries. I haven't had any luck in rejecting orders - it always comes back 10 minutes later with exactly the same order (material and amount).

So make sure you are producing what someone wants to buy. It's worth saving to unlock the second Order List slot as this increases the chances someone will want to buy something you actually have, and give you much-needed cash to upgrade your buildings so you can produce enough of the other orders you have.

More or less the same way you sell the cells, reject the orders until you get the one you are looking for.