I'm heading to climb Aconcagua this month (23000 ft), where it will get cold at times. I'm bringing a D200. Feel free to see a related posting:
Anyway - I know that shooting with a WARM battery will extend the number of shots.
But my question is does the charged battery HAVE to be stored warm to avoid losing its charge when NOT being used. It's just a bit of a pain having all my batteries next to my body or in the sleeping bag all the time.
I'd be particularly interested to hear from someone with a technical knowledge of batteries.
Thanks everyone for your help!
#1. "RE: EN-EL3e and Extreme Cold" | In response to Reply # 0Trekman Registered since 27th Sep 2004Wed 04-Jan-06 02:43 PM
I don't believe you need to have the batteries "with you" to preserve energy power. You just need to protect them from the extreme cold. Have them stashed in your wool socks, extra gloves, or whatever. Your sleeping bag might actually not be the best place, high humidity and high temps, but would be better than just sitting on the floor of the tent.
I am no expect on the do's and don'ts of batteries. When I was younger I was always told to store unused batteries in the freezer, it made them last longer. I have no idea if that is true...we may need to contact "Myth Busters" to know for sure. I do know absolutely for sure though, if you USE the batteries in colder weather they do not last as long, and they can drop EXTREMELY fast in EXTREMELY cold conditions.
But...I don't think it takes that much to protect them. Keep the Body/Lens warmer and they will require less juice, switch to manual focus when you can, only use the LCD screen for brief moments. These little things will greatly increase your batteries staying power. Only use the flash when absolutely required also.
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#3. "RE: EN-EL3e and Extreme Cold" | In response to Reply # 2Trekman Registered since 27th Sep 2004Wed 04-Jan-06 07:04 PM
Yeti's question is simple:
Does storing your battery cold reduce the usable range of the battery when put into use.
I don't know but I would say that it does, at least to a small extent, but I am not a battery expert.
Yeti is looking for a battery expert.
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#4. "RE: EN-EL3e and Extreme Cold" | In response to Reply # 3Yeti69 Registered since 20th Dec 2005Wed 04-Jan-06 08:01 PM
Thanks for the interpretation Trekman! Do you interpret at UN as well? I know you're a climber yourself - I'll keep you posted via the D200 forum how the Aconcagua trip goes. I am still waiting for a D200, but they're confident I'll have it before I leave in 2 weeks.
#5. "RE: EN-EL3e and Extreme Cold" | In response to Reply # 0
My battery experience comes primarily from NiCd and NiMH cells but, in this case, it should apply to Lithium-Ion cells as well...
The issue is that a battery stores and delivers electrical current through a reversible chemical reaction. Reducing the temperature slows down the chemical reaction, and slowing down the chemical reaction will reduce the battery's ability to deliver the electrical current.
Storage of a battery in cold temperature will not reduce its capacity as long as its temperature is increased to a "normal" range when put into actual use. In fact, since all rechargeable batteries have an inherent self-discharge rate, there is evidence that storing a battery cold will slow down the loss of charge but not eliminate it - however, the difference is marginal in many cases. Note that the increase in temperature must have time to soak into the battery core where the chemical reaction is taking place. Raising only the surface temperature will do little to restore battery performance. Keeping the battery close to your body for a couple of hours (maybe less?) should allow sufficient time to bring back most of the battery performance - until it cools down again.
I know that disposable Lithium cells perform much better at cold temperatures than alkaline, NiCd or NiMH cells. However, I've never read whether or not this difference also extends to rechargeable Lithuim-Ion cells.