Not sure where you guys get your NiMH cells from but as a rule you should not charge above 1.5V per cell so no idea how you get 1.6V. After charging thise voltage will decay and settle out at something between 1.28 and 1.35 in my experience (off load) although I can't say I have checked every pack and manufacturers may differ. On load, the cell terminal voltage falls due to the internal resistance by an amount proptional to the current drawn. You should not discharge a cell ideally below 1V, 0.9V worse case.
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