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Old Jun 8, 2002, 3:58 PM   #1
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Default Personal Battery,nimh, Charger Experience???

It has been my experience that the Quest 2 charger and batteries (1600) do NOT last as long (less than 1/2 132 to 240) as the Rayovac 1 hour charger and their batteries (1600).
I've read the difference of opinions as to whether it is better to charge cooler or warmer (hotter). Quest 2 is on the cooler side and Rayovac on the much warmer side.
What about your EXPERIENCE???
Thanks,
Steven
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Old Jun 8, 2002, 6:05 PM   #2
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Steven H

The Rayovac will charge better than the Quest 2 (you can also use the Rayovac to charge the Quest Gold battery) and miuch quicker !!!

Try not to close the cover on the Quest 2 since this charger is usually fool into a full charge by sensing the battery temperature as well and go on to trickle charge which will then take for ever to charge, hence the batteries is undercharge and do not last as long
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Old Jun 8, 2002, 6:30 PM   #3
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NHL,

Thanks for your reply. I never do close the cover on the Quest 2 charger.
It has also been my experience that the Rayovac 1 hour charger is the better of these two.

Steven H

[Edited on 6-9-2002 by Steven H]
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Old Nov 12, 2004, 8:49 PM   #4
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From a safety standpoint, it's a good idea to keep the cover closed as designed. It may affect battery life, but it is safer. If you're not going to close the charger's cover, then at least consider covering it with something that can stop exploding moltenmetal and chemicals.
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Old Nov 12, 2004, 8:59 PM   #5
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Steve wrote in one of his articles that the life of NiMH batteries is improved substantially by keeping them cool during charging, and not letting them get very hot. For example, he recommended a 100 minute4-AA hi-cap charger that kept the batteries cool by using a pulse charge technology. This was about 50 degF cooler than similar fast chargers.

My approach to charging batteries has been to build a shield that covers the exposed batteries for safety, yet has a built-in fanthat keeps cool air circulating over the batteries as they charge. (I used a 12V computer fan) With the fan/shield design the batteriesbarely get warm to the touch. Charged in the charger as designed they are too hot to handle at the end of a charge cycle. There also seems to be an increase in usabletime when charged cool (with the fan)...about 50% more picturesfrom my digital camera in some simple tests I ran (that's without a trickle charge top-off). Steve could probably better quantifyand qualify results good or badwith his test setups.
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Old Nov 12, 2004, 9:11 PM   #6
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I thought I'd mention my charger is an "intelligent" 1hour 8xAA NiMH charger that uses atime/voltage sensing technology.
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Old Nov 12, 2004, 10:32 PM   #7
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One last comment ln my charging techniques...My NiMH chargers monitor and charge cells in pairs. There are some chargrs that charge each cell individually, but most handle them in pairs.

In an effort to maximize the life of my batteries, and improve the capacity, I charge my batteries in pairs matched by manufacturer and capacity. I also periodically measure the voltage of my various AA cells after charging and trickle top-off. I try to get them to a more or less consistent result after charging, and THEN, I pair them up even closer by matching the measured voltageswhere possible (still keeping them paired up by manufacturer and claimed mAh).

My hypotheses are that this helps balance the energy being pumped into the cells during the charging process,one cell isn't overcharged atthe expense of the other, and both cells receive the maximum benefit of the "intelligent" charger. This also helps ensure both cells are more likely tofollow a similar temperature-time curve, so if the charger has a thermal sensor on only one battery,the end result is asif the sensor is working for both.

These are extremely simple things to do, and I believethis process pays off.
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