Have a 12 volt 3 watt LED light want to run on a battery. What mAh size battery will work?
If the LED chain has it’s own regulated supply you can run it off a 12V battery. If not, you will burn it out without a current limit of some sort.
If it is regulated, ie designed to simply run off 12V without further fuzz such as replacement automotive LED bulbs and such it will run off any 12V battery. If you have a 12V@500mA battery you’ll have 6Wh at your disposal or roughly 2 hours worth of light 
60 Watt LED Moving Head – Eternal Lighting Company
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1 x 10W RGB LED 10 Watt Lamp Bright Light High Power Chip D1 $0.01 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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3″ LED Recessed Light: Glare-Free Reflector, 9 Watt $89.95 |
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Cuisinart CPK-17 PerfecTemp 1.7-Liter Stainless Steel Cordless Electric Kettle $79.99 This Cuisinart Perfectemp Cordless Electric Programmable Kettle offers latest innovation for this product category%2E Heating water will never be easier with this handsome brushed stainless steel kettle%2E Great for making tea%2C hot chocolate or instant soups%2E It will quickly bring 1%2E75 quarts of water to a boil and then turn itself off%2E… |
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Sunbeam 5891 2-Pound Programmable Breadmaker, White $60.09 2 LB LOAF13-HOUR DELAY BAKE;12 COOKING FUNCTIONSEXPRESSBAKE BREAD MAKER CYCLE BAKES IN UNDER 1 HOURLED DISPLAYEASY-CLEAN TOUCH CONTROL PANELNON-STICK REMOVABLE BAKING PANINCLUDES INSTRUCTION BOOK WITH BREAD RECIPESUPC : 027045651783Shipping Dimensions : 18.30in X 14.00in X 13.40inEstimated Shipping Weight : 20.6812… |
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Spirit of Cross Stitch with Jean Farish Huls Volume 6 : Hardanger Heirloom $4.84 Andis Illuminator Tourmaline Ionic AC Motor Dryer 1875 Watts Item Number: 82090 Silky radiance, fuller form, faster drying – No-heat LED lights illuminate each section of hair, letting you view the form as you style, preventing over-drying and hair damage. Tourmaline infuses each hair shaft with negative ions, breaking up water molecules for 60% faster drying times, while sealing natural moistur… |
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Earthmate EP05129 5-Watt Dimmable Candle 2700K Bulb, 6 Pack $80.00 … |
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Planet Bike Beamer 1 and Blinky 3 LED Bicycle Light Set $28.99 Planet Bike Beamer-1 Headlight and Taillight Sets are long running light sets with super bright LED’s.LED beam headlight along with BRT-3, 3 LED taillights, batteries includedNew beam puts light where you need itUp to 100 hours of run time on 2 AA batteries (included)LED beam headlight along with BRT-3, three LED taillightsBatteries includedItem SpecificationsWeight208gBattery2 AA& 2AAABulb1 Red L… |
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Planet Bike Blinky Super Flash 1/2-Watt Blaze LED Plus 2 eXtreme LED Rear Bicycle Light $23.00 Whether you’re biking home from school or on a long training ride, the Planet Bike Superflash rear bicycle light will keep you visible to passing cars, pedestrians, and other cyclists. The Superflash is equipped with a 1/2-watt Blaze LED and two eXtreme LEDs, with your choice of flashing or steady modes depending on the situation. The light is also built for long-term use, with an ultra-compact ve… |
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Planet Bike Blinky 7 7-Led Rear Bicycle Light $14.99 The Planet Bike BRT-7 Taillight features 220 degree visibility and a soft-touch flash/constant/off switch.Soft-touch flash/constant/off switch220 degree visibilityIncludes batteries, armstrap, and seatpost and seatstay mountsBrighter LED’sItem SpecificationsWeight60gBattery2AAABulb7 LEDRun Time100+… |
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Schumacher SEM-1562A 1.5 Amp Speed Charge Maintainer $19.00 Float-mode monitoring keeps 6 & 12 volt batteries fully charged; Auto-switch from Full Charge to Float-Mode Monitoring; LEDs indicate: Charging, Charged and Trouble; Quick-Disconnected Harness – Snap connectors in seconds – Use 50-amp clamps or permanently attach to hard to reach areas; Maintain batteries on seasonal equipment; 1.5 amp charger & maintainer; Reverse-polarity protection; Perf… |