Five different life tests of SONY 18650-HC lithium-ion cells have been run for up to 10 years. These tests evaluate the 18650-HC lithium-ion cells under conditions ranging from rapid cycling at 32 cycles per day, to slow cycling at 90 cycles per year, to stand tests that involve no cycling at all. These tests examine the self-discharge of the cells, the divergence between cells in batteries, and their degradation rates ...
A matrix of twelve nickel-hydrogen cells were built in 1988 to develop and validate the Man Tech nickel-hydrogen cell design that has subsequently been used in a wide range of space applications. This cell matrix included three design variations: precharge (hydrogen or nickel), electrolyte concentration (31 % or 38%), and electrolyte amount (drained or drained plus 20 cc). In 2003, eight of these cells were put into a life test ...
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