Do those flash shoes and flash toys represent an environmental hazard? How should they be disposed of safely? [more inside]
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?
Can I stick them inside some other device, or should they just be tossed? [more inside]
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]
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.
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]
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]
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]
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]
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.
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]
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.
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.
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]
Do other peoples' cellphone batteries spontaneously discharge, or is it just me? [more inside]
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]
Why do remote controls work again when you switch the batteries around? [more inside]
How do rechargeable AA batteries in C-battery sized spacers (like these) compare to standard C batteries? [more inside]
Recommendations for AAA (or AA) powered laser pointers that I can use to play with my cat? [more inside]
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]
Can I test/check a Battery Tender Pro? [more inside]
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]
Why am I not supposed to use rechargeable batteries in my vibrator? (NSFW) [more inside]
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?
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]
What's causing this DVD remote control to become too hot to handle? [more inside]
Why does this package of batteries have a "Intended for sale at (STORE X) only" sticker on it? [more inside]
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]
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]
Looking for one of the thinnest, smallest digital cameras that uses AA batteries. Thanks!
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!
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]
Can you help me build an electric motor scooter? [more inside]
Laptop battery recycling: no nearby location will accept mine so far because it's degraded and puffed up. What are my options? [more inside]
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]
Do batteries lose charge? [more inside]
My HP Pavillion dv6000 laptop works fine...except for one little battery related thing. [more inside]
Your digital camera favorite band sucks down the batteries! Is this fixable or would I be better off getting something else? [more inside]
A question of etiquette: Can I change my hearing aid batteries in public? Or do I have to duck into the bathroom? [more inside]
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]
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]
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]
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...
Help me keep my mp3 player charged while I'm travelling! [more inside]
Where can I get compact, water(proof|resistant) and somewhat sturdy battery case? [more inside]
What's the deal with NiMH AA and AAA batteries being 1.2V? [more inside]
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!
What domestic devices can be operated effectively on solar power these days? Know any interesting alternative uses? Wide open question.
Do those "battery powered emergency phone chargers" work? [more inside]
What happens to the energy that is lost from rechargeable batteries when they self discharge? [more inside]
Page: 1 2