Led Battery
Led Battery
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Taylor 9842 Commercial Waterproof Digital Thermometer $8.75 Flat-Edged Dial Safe-T-Guard Thermometer with Antimicrobial Sleeve. Special additive in the sleeve material inhibits bacterial and fungal growth. Thermometer is waterproof for dependable use in kitchen or lab environments. Field calibratable. Auto-off feature saves on battery life. What's Included: One LR44 battery... |
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PUR 3 Stage Vertical Faucet Mount with Filter ... |
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Escali Primo Digital Multifunctional Scale $29.95 Accurately measures in .01 oz or 1 gram increments. 11-lb. or 5 kg maximum weight limit.... |
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Rapid Car Charger with IC Chip for Sprint, Alltel HTC Touch Diamond (CDMA) Smartphone $0.01 Rapid Car Charger with IC Chip for Sprint, Alltel HTC Touch Diamond (CDMA) Smartphone... |
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Pharos REC20 GPS Receiver Only $24.99 12 parallel channels. Built-in antenna. Bluetooth transceiver for wireless communication. 6-hour replaceable, rechargeable Lithium Polymer battery. Enhanced sensitivity receiver offers fast position acquisition time. Blue LED Indicator Glows blue when powered on. NMEA-0183 data protocol. Superior navigation performance in urban, canyon and foliage environments. Rigid shock and vibration compliant.... |
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2 Rapid Car Chargers with IC Chip for AT&T LG Shine CU720 $0.06 ... |
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China - At the Crossroads (Teach English to Chinese Students) $9.20 Description: This Palm Treo 500V retractable car charger features a retractable wire. It's compact size and ergonomic design makes the charger a very convenient product to use in your car. With the rapid retract button located on the top of the charger, press down to retract the full length of the cable. Palm Treo 500V Car Charger Features: Smart IC chip recognizes a fully charge... |
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Mr Beams MB360 Wireless LED Spotlight with Motion Sensor and Photocell - Weatherproof - Battery Operated - 140 Lumens $19.99 Mr. Beams Intelligent LED Battery-Operated Lights MB360 Spotlightat a Glance: Battery-powered, wireless LED spotlight |
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Dorcy 41-2510 4 LED Carabineer Floating Waterproof Flashlight with Batteries $3.43 The 3AA - 4 LED Carabineer Flashlight features a waterproof design with floatability. This flashlight is constructed with shock absorbing rubber around the head and the body of the light. The rubber design around the body allows for a slip-free comfortable grip, ensuring stability and durability. The 3AA - 4 LED Carabineer Flashlight has a uniquely built-in tail cap carabineer clip and comes compl... |
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Belkin Mini Surge Protector Dual USB Charger $12.99 Protect your electronic devices while traveling.... |
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Sony 3DBNDL/ALICE 3D Deluxe Starter Kit, Black $121.49 Sony 3DBNDL/ALICE ALICE 3D BRAY DISC & 3D-STARTER KIT... |
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Samsung SSG-P2100X/ZA (IMAX/Dragon) 3D Starter Kit, Black $99.99 Samsung's new battery powered 3D Active Glasses are the gateway to Samsung 3D entertainment. Impressive both in how they function and in what they allow you to experience, the technology works as follows: When you put them on and look at the screen, the technology first blocks the left and then the right lens. It happens faster than the blink of an eye - so your eye won't notice it. But when image... |
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Philips Norelco NT9110 Precision Nose and Ear Trimmer $14.99 The NT9110's Tube Shave technology makes nose and ear hair trimming safe, fast, and easy. The ultra sharp, closed cutting system avoids pulling for a more comfortable trimming experience. The guarded system also protects against nicks and cuts. This unique and patented tube technology integrates a miniature trimming head for increased visibility, maneuverability and precision.... |
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Remington MB-200 Titanium Mustache and Beard Trimmer $23.99 Remington MB-200 Precision Titanium Mustache & Beard Trimmer is an adjustable beard groomer features nine length settings and Titanium coated blades that are strong, durable and long-lasting. The beard groomer's self-sharpening blades always stay sharp, always stay precise. This is the perfect tool for any beard, allowing you to trim, detail, edge and shape. The all-in-one unit features built-in c... |
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Sanyo NEW 1500 eneloop 8 Pack AAA Ni-MH Pre-Charged Rechargeable Batteries $16.99 The SEC-HR4U8BPN 4-AAA Eneloop battery pack utilizes SANYO's advanced rechargeable battery technology allowing them to last longer than ever before! Unlike disposable batteries which can only be used only once and are wasteful to the environment, the eneloop batteries can be recharged up to 1,500 times. They come pre-charged, can be used immediately out of the pack and maintain 75% of their charge... |
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LED Sound Activated E-Q T-Shirt (Medium) $13.99 The E-Q is a shirt with a built in sound sensitive spectrum analyzer. As the music beats, the equalizer moves to the beat of the music! Each frequency of music will activate a different equalizer bar, just like the equalizer on your stereo at home! Its a must have accessory for all concerts, parties or even raves! It has a fully functional Electro Luminescence panel with a battery pack that snuggl... |
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BLUE LED SHOELACES $0.01 Can be used on shoes or anywhere on costume. They are the newest thing on the led market today and kids go nuts for them. They are fun for festivals, clubs, raves and discos too. They are very strong to last a long time and small batteries to last days. 3 Flashing settings: on/off, Flash, Double Flash. Made of high transparent plastic material. Washable and safe without wires. Batteries incl. One ... |
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VanGoddy Premium Black Leather Messenger Bag for Samsung Galaxy Tab 8.9 Inch & 10.1 Inch Tablet Device + Vangoddy 3-In-1 Stylus (Stylus Laser Pointer & LED Flashlight)**Batteries Included** $87.99 **Carry Your Galaxy Tab Device In Style!!!** The VanGoddy line of high-quality Galaxy Tab device accessories is proud to introduce the "Slinger" Luxury Leather Messenger Bag! This exclusive bag is has an exquisite soft & durable leather exterior and is lined with a scratch-preventing micro suede interior. This bag is perfect for students, professionals, or anyone who lives an on-the-go lifestyle! ... |
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Snap Circuits SC-300 $32.75 This educational kit is loaded with more than 300 projects to build. For example, kids can learn how transistors and capacitors function, and how to make time-delay circuits. In addition, this version includes circuits showing how oscillators and photo sensors work. Projects involve an AM Radio, Burglar Alarm, Radio Announcer and more. Contains over 60 parts. Requires 4 "AA" batteries, not include... |
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Syma S107/S107G R/C Helicopter *Colors Vary $15.59 This Brand New 3 Channel Gyro mini Metal rc helicopter is 1 of the world's newest, smallest and lightest RC Helicopter you can get! At approx. 7.5" long, it easily fits in the palm of your hand and is fully functional, equipped with latest Gyroscope technology, which makes this helicopter an instant hot seller in the RC World. This mini Gyro Metal helicopter charges directly either from the USB ca... |
How long can a AA battery power a LED?
I have a brand new AA battery powering a single LED (with resistor). How long do you think I can keep this LED on before the battery runs out of juice? (no, i dont know what resistor or LED strength I have, but it ...does that matter?) The LED is of standard brightness if that does matter.
Well there's a whole bunch of different variables there.
First, an alkaline AA battery can hold from 1700mAh to almost 3000 mAh (Wikipedia). This is what governs how long it will last. An LED typically draws around 30mA (I assume you're not using a very bright one). So if you have a 3000 mAh AA battery and you're drawing 30mA, expect it to last 100 hours.
However, this is immensely complicated by the resistor and by the fact that most standard LEDs don't even light until you're running with over 1.7V. So yes, we do need to know what sort of LED you're using and what the value of the resistor is before we can give a more precise answer.
Rough guess - hope for 50 to 100 hours.