They sent everything was needed to replace the battery . I would just recommend to provide better quality tools in the kit , more in detail there are several thin flat cables to disconnect and the tweezers didn’t help so much. Then the smaller torx bit isn’t robust enough to prevent damages to the screw’s heads .
This procedure isn’t for everyone, there is a high risk to damage the computer because there are a lot of tiny and fragile parts to remove, and the use of solvent to unglue the old battery is risky , anyway following the hints from the procedure helped a lot.
I used an anti static mat as the motherboard and other parts inside the mac are at high risk of damage from statics .