86 posts tagged with batteries.
Displaying 1 through 50 of 86. Subscribe:

Running LED strip off batteries

I would like to run some portion of one of those cuttable LED strips off of a battery or batteries. Is this possible? How do I calculate how to do that given that these strips use 12v DC converters to run when plugged in?
posted by OmieWise on Nov 9, 2016 - 7 answers

Will what I'm planning to do ruin my Prius battery or my life?

I am replacing a single cell in my 2005 gen II Prius' battery pack. In order to equalize the voltage in all of the cells I plan to temporarily wire all of them in parallel. Is there some reason not to do this? [more inside]
posted by cmoj on Jul 19, 2016 - 15 answers

Power on the Playa

What are my options for power while on the playa at Burning Man for 4-5 days? I don't want to buy or use a generator. [more inside]
posted by otherwordlyglow on Jun 2, 2016 - 17 answers

Fruit and veg batteries

Potato batteries and various forms of citrus batteries are, as best as I can tell, most accurately described as chemical batteries. But that sounds so boring! Do they not have a more sciency name? Like electroconvalent batteries or something? [more inside]
posted by Iteki on May 17, 2016 - 6 answers

Do I need a Superfund to clean up my kids’ shoes?

Do those flash shoes and flash toys represent an environmental hazard? How should they be disposed of safely? [more inside]
posted by littlewater on Jan 7, 2016 - 6 answers

Why don't they charge small batteries in parallel?

I'm sure this is a stupid question, but I wondered. Why don't cell phones and other chargeable electronics charge multiple small batteries in parallel? The analogy is like this: * I have one cell phone with a large battery that takes 3 hours to charge. * I have three cell phones with small batteries that take 1 hour to charge. Why can't cell phones just have 3 smaller batteries and charge them all at the same time, and therefore make the charging faster?
posted by jonclegg on Nov 16, 2015 - 8 answers

Are batteries that can't power a smoke detector still useful?

Can I stick them inside some other device, or should they just be tossed? [more inside]
posted by Make Way for Ducklings! on Nov 4, 2015 - 13 answers

Any CE devices that can recharge AA/AAA batteries within themselves?

I'm wondering if there exist any (portable) consumer electronics devices - so like music player, mouse, flashlight, audio recorder - that take any chemistry rechargeable AA or AAA batteries, and can recharge them right in the device. [more inside]
posted by attercoppe on Dec 15, 2014 - 20 answers

Advice on purchasing Long Life AA Batteries

Most cheap non-rechargeable AA Batteries (typically from China) go flat very quickly. About 15 years ago, typical batteries seemed to last about 4 times longer (my subjective opinion). I want long lasting batteries, what is a good type, what should I look for, what terminology "alkaline?". Thank you.
posted by happy_sausage on Aug 30, 2014 - 13 answers

No one will pay for wheelchair repair, even with Medicaid... now what?

YANM medical billing professional, but I need help in getting my very expensive, recently-out-of-warranty electric wheelchair fixed. I live in NY, have (crappy) private insurance ( Oxford Liberty) through my mother's job and Medicaid due to a cerebral palsy diagnosis. My chair ( an Invacare model) was provided through my previous insurance and OL isn't accepted by the contractor that provided it. They take Medicaid, but refuse to put in a claim and keep passing the buck. I can't leave my house. What do I do? [more inside]
posted by marsbar77 on Jul 16, 2014 - 17 answers

4 Solar panels and salespeople that want sales

So I find myself with 4 185 W Solar panels AND 4 enphase M190 Micro inverters (that onboard connect to each panel). The system from what I can tell is "made" for a grid connected solar system. Which is great but NOT what I want/need (Also I am too far from a station to qualify for microfit in Ontario). [more inside]
posted by mrgroweler on Jul 3, 2014 - 5 answers

Correct way to charge rechargeable devices (iPhone, laptop, toothbrush)?

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 - 7 answers

Roomba, Roomba, wherefore art thou, Roomba?

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 - 17 answers

My iPhone doesn't do well in the cold. What can I do?

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 - 14 answers

Ideas and advice for a DIY electric bike on the cheap.

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 - 12 answers

How caustic are alkaline batteries?

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 - 7 answers

how to make tasty edible batteries

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 - 11 answers

Put me in charge!

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 - 9 answers

Is this another useless superpower?

Do other peoples' cellphone batteries spontaneously discharge, or is it just me? [more inside]
posted by still_wears_a_hat on Sep 6, 2012 - 15 answers

Who's working on (or thinking about) the GMO battery tree?

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 - 11 answers

Why does switching the batteries work?

Why do remote controls work again when you switch the batteries around? [more inside]
posted by AD_ on Apr 26, 2012 - 5 answers

Does a AA battery dressed as a C battery work the same as a real C battery?

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 - 9 answers

AA or AAA laser pointer recommendations for cats?

Recommendations for AAA (or AA) powered laser pointers that I can use to play with my cat? [more inside]
posted by entropicamericana on Dec 27, 2011 - 10 answers

9V batteries - what the heck are you good for?

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 - 9 answers

Can I test/check a Battery Tender Pro?

Can I test/check a Battery Tender Pro? [more inside]
posted by gally99 on Dec 17, 2011 - 5 answers

What matters when buying a laptop battery?

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 - 10 answers

Do not use rechargeable batteries -- but why?

Why am I not supposed to use rechargeable batteries in my vibrator? (NSFW) [more inside]
posted by anonymous on Sep 26, 2011 - 16 answers

Why are laser pointers cheaper than laser pointer batteries?

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 - 12 answers

Jumpin Jack Flash It's NOT a gas gas gas

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 - 18 answers

DVD remote too hot to handle!

What's causing this DVD remote control to become too hot to handle? [more inside]
posted by motown missile on Apr 3, 2011 - 6 answers

Don't even think about doing whatever you were going to do.

Why does this package of batteries have a "Intended for sale at (STORE X) only" sticker on it? [more inside]
posted by The Lurkers Support Me in Email on Mar 16, 2011 - 11 answers

Circuit/Battery combos for driving a single 5mm LED

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 - 6 answers

These Blackberries don't taste so good...

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 - 3 answers

thin camera with AA batteries

Looking for one of the thinnest, smallest digital cameras that uses AA batteries. Thanks!
posted by luvmywife on Oct 29, 2010 - 2 answers

Safely charging NiMH batteries

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 - 2 answers

Lithium battery capacity derating: C-rates

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 - 6 answers

Please help me build a motor scooter!

Can you help me build an electric motor scooter? [more inside]
posted by banished on Sep 9, 2009 - 6 answers

recycling a degraded rechargeable battery

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 - 8 answers

How is incoming charge distributed amongst multiple batteries wired in parallel?

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 - 16 answers

Can I power my keyboard in 2019?

Do batteries lose charge? [more inside]
posted by Brennus on Jun 15, 2009 - 8 answers


My HP Pavillion dv6000 laptop works fine...except for one little battery related thing. [more inside]
posted by Neonshock on Apr 11, 2009 - 4 answers

I'm getting sick of no point and click!

My Your digital camera favorite band 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 - 16 answers

Public Display of Deafness

A question of etiquette: Can I change my hearing aid batteries in public? Or do I have to duck into the bathroom? [more inside]
posted by still_wears_a_hat on Mar 7, 2009 - 35 answers

Can an Xbox recharge rechargeable batteries?

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 - 4 answers

Appropriate power adapter for a Roland A-33 midi controller?

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 - 10 answers

How should someone in London dispose of a printer?

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 - 5 answers

Batteries were included!!!

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 - 9 answers

Where to find a battery USB charger?

Help me keep my mp3 player charged while I'm travelling! [more inside]
posted by tomble on Apr 7, 2008 - 9 answers

Where do I get a waterproof battery case?

Where can I get compact, water(proof|resistant) and somewhat sturdy battery case? [more inside]
posted by strangecargo on Jan 30, 2008 - 10 answers

NiMH AA and AAA batteries are 1.2V?

What's the deal with NiMH AA and AAA batteries being 1.2V? [more inside]
posted by knave on Jan 11, 2008 - 32 answers

Page: 1 2