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2010 AA Low Self Discharge Battery Review - "The big one"
I wonder if I have had particularly good batches of batteries or whether my lower charging rate is better for the batteries??
Are those values discharge values or charge values? It seems like charge values to me.
In the MAHA MH-C9000 Charger-analyzer you can read:
"Note the charging capacity is usually higher than the actual capacity of the battery owing to some energy lost as heat. Charging capacity
cannot be used to judge the performance of the battery. Instead, it can only be used to determine the progress of the charger. It is normal
for this number to exceed the actual capacity by as much as 20-30%."
www mahaenergy com/download/mhc9000 pdf
That's why MAHa shows discharge values to determine true capacity: "For REFRESH & ANALYZE, BREAK-IN, DISCHARGE mode, the total discharge capacity will be displayed. “AVAILABLE CAPACITY” icon will also be shown."
It is really interesting to read about your findings. I think what we are seeing here is the difference in the calibration of our 2 chargers combined with the different charge and discharge rates. I have a high regard for GP as a brand which is why I wanted to include them in my tests.
It certainly does prove that as for any type of testing it should be ideally done using the same calibrated charging equipment. I am so pleased that you took the time to do your own experiments which give another good source of information.
Cheers
Chris
Perhaps he is quoting charging, and not discharging capacity values. Or if his values are also discharging like in the MAHA charger, then his charger must have dicharged them "fuller" than MAHA and/or charged them "fuller" than MAHA (unlikely).
Re: 2010 AA Low Self Discharge Battery Review - "The big one"
Another very good test, which shows how capacity is changing with different load over time:
www candlepowerforums com/vb/showthread.php?79302-NiMh-Battery-Shoot-Out
Re: 2010 AA Low Self Discharge Battery Review - "The big one"
One possible missing aspect in the review is whether the batteries maintain their voltage. Normally rechargeables have a very flat discharge curve followed by a sudden drop when they run out. However I have had repeated problems with a significant minority of Uniross Hybrios which only keep at 1.2V or above for a relatively short while, and drop to around 1.1V. I've seen this in my intelligent battery charger (which can also monitor discharge). The overall capacity isn't badly affected though (my charger stops discharging at 0.9V). But this .1V can make all the difference to useful operation, especially if you're already substituting for normal 1.5V cells. As a result I don't buy Hybrios any more as there have been too many of such dud batteries. Perhaps any future update of these reviews could also report what their voltage was at the theoretical half-way point of discharge, or perhaps just after a fixed 1 hour of discharge?
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