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In scientific studies you are seen as an adult. Regarding the ability to hear high frequencies, your ability to hear them starts to diminish at age of 8. So statistically when you become 18 you should hear sound in 16 kHz range. Therefore your high frequency hearing is at least normal / above average. It is possible that in proper hearing test you could achieve slightly better results (it wouldn't be lower then 17 kHz).
I have it as well; it's really annoying.
Hi,
This is generally fine, but the higher capacity cells like the 2700 mAh ones will sustain fewer cycles before they wear out. The only way to squeeze the higher capacity into those cells is to make the parts thinner, smaller and more fragile so that more can fit into the same volume. A rule of thumb is that 2700 mAh cells will tend to wear out after less than 100 cycles, whereas 2000 mAh cells might last for 200 cycles or more. The latest Eneloops are advertised to last for 1500 cycles, but those are special marketing department cycles and should not be taken as an indication of what you will actually achieve. It will however be way more than 60.
Applying carefully timed high current pulses before charging is not a generally recognized way to revive or recondition NiMH batteries. There was a possible reason for doing it to NiCd batteries but that reason does not apply to NiMH.
, when doing the Refresh and Analyse (which I note goes through steps Charge, Rest, Discharge, Rest Charge) as suggested from 1 to 3 times when attempting to rescue batteries is it recommended to intersperse the Refresh and Analyse stages with a Discharge stage in between or simply repeat them?
With Refresh and Analyze the idea is to repeat until there is no further improvement. So if you do a Discharge after the Refresh has finished you can compare that reading to what the R&A reported. If the new discharge reading has increased it might be worth doing another R&A, otherwise not. If you have any plans on storing the cell rather than using it immediately, then discharging it is also a good idea, since traditional NiMH cells (not the new low self-discharge variety) last better if they are stored in a discharged state and cycled every six months or so.One more question, sorry
I assume the charger will on the 2nd and 3rd runs just check and top off then go into rest and then discharge, rest and charge so no harm done but I wanted to check that this was the way it was intended to be used.
Also, I'm assuming that if Break in is used on a cell then one should use Discharge before doing this (unless brand new and not pre charged)?
You are right, it is not obvious. However, the Break-In cycle applies a measured and deliberate overcharge to the cell, which relies on the recycle reactions inside the cell being able to absorb and throw away the excess charge. If a cell happens to be somewhat worn out, then the ability to dissipate excess charge may be worn out as well. Therefore it is best to start gentle, and increase the charge rate if the cell can handle it. If the first Break-In cycle on the cell gives a higher capacity, then by all means use that capacity for the next Break-In.
Remember they started out as claimed 2700mAh cells, which doesn't necessarily mean they ever got anywhere near 2700mAh.
