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tncaver wrote:One reason I haven't been using rechargeable batteries is because they died after getting wet. I tried them in several caves and discovered they were fine in dry caves but they died every time I went in caves where the water was deep enough to flood the battery pack trapped to my belt.
tncaver wrote:xcathodex, do you know how waterproof the newer rechargeables are? If they can withstand getting wet, I may want to switch over to them. But I would still keep alkalines around for back up. Having to continuously buy alkalines is a hassle at times. If any of you have ever arrived at a cave to discover you were out of batteries, then you can relate to running out when you least expected it.
xcathodex wrote:now your turn. why on earth wouldn't we all be using rechargeables? i feel like i'm missing something.
Hybrids NiMHs pretty much solve that problem. Though, I think there are other issues.driggs wrote:Their purpose is to sit there until they are needed. Sometimes that means that weeks or months go by without them being used, or only used very lightly. When my primary dies, I don't want to take any chances that my backup has only 50% charge because it's been in my pack for a month, and I don't want to charge 12 AA cells the day before every caving trip.
Squirrel Girl wrote:So what about rechargeable Li-ion AAs?
e.g., http://www.batteryspace.com/index.asp?P ... rodID=1336
Squirrel Girl wrote:So what about rechargeable Li-ion AAs?
e.g., http://www.batteryspace.com/index.asp?P ... rodID=1336
driggs wrote:xcathodex wrote:now your turn. why on earth wouldn't we all be using rechargeables? i feel like i'm missing something.
Because NiMH cells are 1.2V and most devices expect 1.5V per cell. The result of this is that devices either don't work, or work at a reduced "output" (dimmer light, shorter runtime, etc).
I've read that elsewhere, too. I'm not an expert at all on this, but I read it yesterday on another website that seemed trustworthy.arkcaver wrote:driggs wrote:xcathodex wrote:now your turn. why on earth wouldn't we all be using rechargeables? i feel like i'm missing something.
Because NiMH cells are 1.2V and most devices expect 1.5V per cell. The result of this is that devices either don't work, or work at a reduced "output" (dimmer light, shorter runtime, etc).
Umm, not really. That is a very common misconception about Alkalines vs. NimHs. It is true that Alkalines have a higher INITIAL voltage, but it doesn't last long. These charts shows the voltage drop in alkalines. If your light has a 1amp drain then your alkalines are at 1.2 volts (the same as NiMHs) in about 10 minutes.
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