NIMH or NiMH may refer to:*Nickel metal hydride battery, a type of rechargeable battery National Institute of Mental Health, a part of the United States National Institutes of Health National Institute of Medical Herbalists, a British organisation of professional medical herbalists dating back to 1864 Mrs. Frisby and the Rats of NIMH, a children's book by Robert C. O'Brien. The Secret of NIMH, a 1982 animated film by Don Bluth.… (More on Nimh)