Hey guys, I just got some new Energizer 2500s (I know they're crap, but I had to try these cells again considering I got a new smart charger). Well from what I observed, these things when placed in my smart charger doesn't seem to stop charging and gets pretty hot. All my other cells (mainly RayoVac Hybrids) stop and barely get warm. Any ideas as to why it's like this?
it is like that because the rate of charge is not high enough to cause a visable voltage drop.
if you have a really smart charger , increase the rate to something usable. (for energypster 2500s use 500-700)
if the rate does not go over the overcharge rate for the cell, the cell itself does not voltage drop, because it did not go into (what i call) a overcharge state. the battery is handling the overcharge.
( or the voltage drop does not occur QUICKLY enough, or far enough, for the computer. the computer looks on a time interval for the voltage to drop )
does this cause the battery to become damaged? or is it the other way around, that reaching the overcharge State, is the damage point.
i donno for sure.
but my energysers that got high self discharge (bad) , were charged at a RATE that did terminate, and i know because i didnt get abnormally high charge MA readings.
so which does more damage? the million doller question.
charging so fast that it reaches an overcharge state?
or charging slow enough that the battery doesnt reach that state, and handles the overcharge rate?
there is one thing we can know for sure, keeping the battery charging WHEN its in an overcharge state, above the overcharge rate, is bad, its very very bad, and a cell will even vent, the wrapper will peel back from heat, and it can destroy the cell in a single instance of that.
(observe differences in the words i use, overcharge- meaning charging the battery that is 99% charged. overcharge Rate - the power going in when the battery is 100% charged. overcharge state - battery heated, pressure rise, voltage drop)
a few cycles of a battery, and it reacts differentally, so you see this more often with a battery that has not been recentally cycled, i am not making excuses for it, it just is so.
a battery that Handles the overcharge Very well, is less likly to have a voltage drop.
adding:
because with a 200-250ma rate, you less likely get a vdrop, but at that rate, your still pushing a lot of heat through the battery.
if a dumb or slower charger would SLOW down at the end, a 100ma rate would be much easier for the battery to expend the heat.
a charger with a max 1.5 -1.6v charge, would slow down lots, and this kinda thing shouldnt be an issue at low rates.
