I've just been told at the Apple store that it's a bad idea to keep the iPhone plugged into the power for long periods when fully charged, and that if possible I should really only charge it when it tells me to (ie. when the battery is almost dead). [more inside]
posted by Dragonness
on Dec 30, 2013 -
Will a robotic vacuum be an asset to our (snowflake filled) home? If so what makes, models, or features are worth the cost nowadays? First hand experience preferred but any input is welcome. [more inside]
posted by RolandOfEld
on Dec 17, 2013 -
I bought my iPhone last February. During what remained of that Winter, I would take it with me when cross-country skiing, walking outside, or taking the bus to work. It seemed to operate just fine, as had my prior phone which was a Samsung. This Winter, however, the cold weather seems to be seriously affecting the phone's battery life. The battery drains quickly when I'm outside and sometimes suddenly goes from 20% or more to dead. Today, I went out skiing with the phone. I was listening to a podcast and using an exercise app to track my speed and distance. When I started out the phone had 55%, but it died after only 10 minutes. The temperature was -10F/-23C. I've also had it drain quickly after waiting to catch the bus.
Is there anything I can do to solve this problem and continue to use the phone in the Winter? Is this something the folks at the Genius bar can help with? Should I create some sort of insulated pouch for the phone? I realize that temperature can affect batteries, but I'm surprised because I didn't have this problem other winters. I know I've taken phones out in colder weather than today without such a sudden failure.
posted by Area Man
on Dec 7, 2013 -
For a long time I've thought that it would be a fun project to put together an electric bicycle. However I've been stymied by the cost and questionable quality of the existing kits, and the complications and compromises of the various DIY methods that are out there online. I have some ideas for how to go about making a cheap and simple electric bike, but I'll be the first to admit that I'm nobody's idea of an engineer so I thought I'd run some things by y'all and see what insights you have. [more inside]
posted by Scientist
on Oct 29, 2013 -
I had some AA energizer max alkaline batteries in my keyboard and one leaked. When I went to remove it some one the powder got between the keys on my keyboard. How caustic is the potassium hydroxide solution in this stuff? Is it concentrated or pretty diluted? Is it safe when its dry? I cant easily clean between my keys.
posted by john123357
on May 26, 2013 -
I remember testing 9 volt batteries with my tongue as a kid to see if they contained charge, and having a truffle or cordial that behaved like that would be neat. and perhaps it could be hooked up to a grape or jelly that would glow when current is applied. Is this possible? people decorate foods with metal, so maybe there is edible grade metal that could work as the leads.
posted by bleary
on Apr 27, 2013 -
Explain to me the technology of charging devices. Is it mainly about voltage? About current? How close to the "required" values must you be? [more inside]
posted by Obscure Reference
on Nov 16, 2012 -
Are there any sci-fi (or scientific) examples of people exploring the idea of "battery trees" - genetically engineered organisms which harness photosynthesis to store electrical energy? [more inside]
posted by unmake
on Jun 1, 2012 -
Why do remote controls work again when you switch the batteries around? [more inside]
posted by AD_
on Apr 26, 2012 -
How do rechargeable AA batteries in C-battery sized spacers (like these
) compare to standard C batteries? [more inside]
posted by Xalf
on Jan 18, 2012 -
Burning Man leftovays: 9V batteries - lots of them! Suggest me some cool $20-$40 or less items that would help me use them up. [more inside]
posted by HeyAllie
on Dec 19, 2011 -
How can I be sure that I didn't get ripped off with a replacement laptop battery with regards to number of cells, voltages and mAh ratings? [more inside]
posted by daHIFI
on Oct 12, 2011 -
We have young indoor cats who require constant stimulation, and of course that means that having a working laser pointer on hand at all times is essential. I can get laser pointers really cheap ($1.49) at the dollar store, with batteries included. But if I just want to replace the batteries it costs an arm and a leg. What gives?
posted by aunt_winnifred
on Aug 19, 2011 -
Car battery dead at JFK long term parking after 3 week business trip. Port Authority Customer Care jumped it but it wouldn't keep a charge. What the hell do I do now? [more inside]
posted by spicynuts
on Aug 8, 2011 -
I'd like to use a single 5mm UV LED (3.4Vf, 20-25mA)
to charge a daub of glow-in-the-dark paint. It only needs to be lit around 1 minute of every 10 (or 6 seconds of every 60), and only when the (room) lights are out. What battery/circuit would be most economical to operate, and require the least-frequent battery changes? [more inside]
posted by jjjjjjjijjjjjjj
on Jan 18, 2011 -
Do you know anything about defective Blackberry batteries? Is there a definitive way to tell if a battery is from a defective batch? A list of bad serial numbers? Or a way to tell visually? [more inside]
posted by radioamy
on Dec 18, 2010 -
Looking for one of the thinnest, smallest digital cameras that uses AA batteries.
posted by luvmywife
on Oct 29, 2010 -
Rechargeable batteries: Any difference between NiMH batteries purchased in Europe vs. US? I have several AA batteries I bought in Eur for my camera, but I don't have my charger with me in the US.
1. If I buy a charger in the US, can I charge the batteries I bought in Europe?
2. When I go back to Europe, is it OK to use the US charger on the European current with just an adaptor for the plug?
I just want to make sure I don't (a) start any fires! or (b) damage the batteries.
The batteries I have are all either 2000 or 2650.
thanks for your help!
posted by leticia
on Jan 29, 2010 -
Asking for someone else: is it possible to calculate or estimate the capacity derating of a lithium polymer battery when discharged at high C-rates? [more inside]
posted by Green With You
on Dec 2, 2009 -
Laptop battery recycling: no nearby location will accept mine so far because it's degraded and puffed up. What are my options? [more inside]
posted by randomstriker
on Aug 10, 2009 -
Say I have a three batteries (all 12V SLA of the same Ah capacity) wired in parallel to form a bank. I connect a dumb charging source (let's say 12V, 5A). How will the incoming charge be distributed amongst the three batteries, and what does it depend on? [more inside]
posted by gribbly
on Jul 27, 2009 -
My HP Pavillion dv6000 laptop works fine...except for one little battery related thing. [more inside]
posted by Neonshock
on Apr 11, 2009 -
sucks down the batteries!
Is this fixable or would I be better off getting something else? [more inside]
posted by Kid Charlemagne
on Mar 12, 2009 -
If I put rechargeable batteries (batteries, not a battery pack) in an Xbox 360 controller, and plug in the charge wire that is typically used for their battery packs, what will happen to my rechargeable batteries? Will they actually recharge? Will nothing happen? [more inside]
posted by AlbatrossJones
on Feb 27, 2009 -
Help me find a power adapter for my Roland A-33 keyboard. I've tried what seemed obvious and haven't made much progress. [more inside]
posted by larsks
on Feb 1, 2009 -
Trying to get rid of a printer, some battery packs and an old PDA, without simply throwing them in the black bag. How does one recycle electronics ethically in London? [more inside]
posted by marmaduke_yaverland
on Jan 26, 2009 -
This should be a simple question, but I cannot find exactly what I need.
I found a year old camera the other day in a box that had been left with batteries in it. There is some corrosion from the period of time the batteries had been in there. The camera is still pretty new, but I need to know how to remove the corrosion so that I can still use it. Any ideas!?
No bonus point for anything since bonus points wont (and never do here) really do you any good. Thanks in advance friends...
posted by TeachTheDead
on Sep 21, 2008 -
Where in northern Virginia can I get a battery pack for my SAD lightbox? It's the P1 from Apollo Health
, and I'm hoping for a battery pack before a trip this weekend. Thanks for any help!
posted by selfmedicating
on Jan 10, 2008 -
What domestic devices can be operated effectively on solar power these days? Know any interesting alternative uses? Wide open question.
posted by vizsla
on Dec 28, 2007 -
What happens to the energy that is lost from rechargeable batteries when they self discharge? [more inside]
posted by smithygreg
on Oct 29, 2007 -
The battery in my G4 Powerbook won't charge, and I am a long way from any technical help! [more inside]
posted by Rumple
on Jul 30, 2007 -
Fixing problems with a 14.4 V cordless tool charger, or if that doesn't work, turning it into a "corded tool." [more inside]
posted by drezdn
on May 30, 2007 -
So Energizer or Duracell? Or some other brand? I'm confused. Apparently they are both 5 times more powerful than the other. I'm looking for the best value-for-money AA battery on the market (i.e. battery hours per dollar). I understand it depends to some extent on the device. Let's say two devices - the TV remote control - and a digital camerra. Anyone have a link to the definitive report? [more inside]
posted by zaebiz
on May 13, 2007 -
Music video song filter: I believe the song/video was released in 1999. The music video consisted of people walking around with batteries strapped to their backs and I believe one of them was in the brain of a mini-robot. The song was on the charts the same time Britney Spears released, "Baby One More Time" but it was dramatically different than anything she would ever put out. I believe it was a male group.
posted by 913
on Apr 18, 2007 -
I'm trying to figure out what kind of batteries are going to be the best option for several small electronic items that are going with me to Uganda/Sudan next week... [more inside]
posted by shawnmk
on Mar 15, 2007 -