they are replacing the battery, provided battery replacement is warranted, for US$250.
Apple has chosen to have fewer sub-assemblies, to reduce the total cost of all parts on the shelf. They are using assemblies to cover multiple different repairs.
As you heard, the keyboard replacement costs US$800, but battery replacement cost just US$250. guaranteed, no surprises, with. 90, data warrant. (in a few cases, the "no surprises" keyboard repair might require a new mainboard, which increases the cost Apple charges when you complain of keyboard malfunction)
if your ONLY issue is key-repeating, you know that is controlled by a keyboard setting, RIGHT?