It isn’t clear yet how plans by Spectrum Brands to sell its battery and appliance businesses might affect its 12-hundred Wisconsin employees.  The Rayovac battery business was started in Madison more than 100 years ago.  Four hundred of Spectrum’s 670 employees at its Middleton headquarters are employed in the batteries and appliances division.  The company plans to sell that division in 2018 because it wants to concentrate on its faster-growing, higher-margin divisions — like pest and weed sprays, pet supplies, auto care and plumbing products, and locks.