If two or more batteries are hooked up together in a series circuit, they have to be arranged so that the positive (+) end of one battery is touching the negative (-) end of the next.
(two or more batteries; are hooked up together; L:in a series circuit) (they; to be arranged; ) (the positive (+) end of one battery; is touching; the negative (-) end of the next)
two or more batteries they the positive (+) end of one battery
are hooked up together to be arranged is touching
L:in a series circuit
the negative (-) end of the next