Mr Happy
Flashlight Enthusiast
Re: Initial charge on Eneloops (AAA)
There is no need to use a fan for cooling unless you notice the cells getting uncomfortably hot at the end of charging. Slightly warm or even mildly hot is not a problem.
The cause of the -delta V signal is the rise in temperature of the cell. It is the way the chemistry works; the voltage decreases as the temperature increases. What happens is that when the cell is full and can no longer absorb much charge, the excess current gets converted to heat, and this heat raises the temperature and produces a small drop in voltage. The charger senses this drop and stops charging.Should I stop providing ventilation to the cells? :sigh: Part of the reason I did this was to put the charger in a position where if it did "melt down" it wouldn't damage anything. :thinking: The BC-900 actually senses the temperature of the cells in determining -delta V termination? How does it do that? Separate temperature sensors under each cell?
There is no need to use a fan for cooling unless you notice the cells getting uncomfortably hot at the end of charging. Slightly warm or even mildly hot is not a problem.
Last edited: