You probably mean to ask: What is the self discharge rate of a NiMH battery? The rate of self discharge for any battery depends on the temperature at which it's stored. Stored at 70 degrees F (20 C) NiMH batteries will lose up to 40% of their charge within a month. If they are stored at a higher temperature, they will self discharge at an even higher rate.
General Interest. Erie Canal opens. The Erie Canal opens, connecting the Great Lakes with the Atlantic Ocean via the Hudson River. Governor DeWitt Clinton of New York, the driving force behind the project, led the opening ceremonies and rode the canal boat Seneca Chief from Buffalo to New York City.
189 years ago this month, the Erie Canal opened. That connection between the Hudson River in New York and Lake Erie became extremely important to Michigan, which at the time of its construction was on the road to statehood. Dan Ward is curator of the Erie Canal Museum. He says the Erie Canal was incredibly influential on the history of Michigan.