This looks good but I need the reverse. I want to charge a small battery via USB and use the power generated on a small led?
1583484
The reverse of this would be anything that discharges a single lithium cell (battery?) A single cell lithium LED flash light should work well.
1583485
as long as you have the correct battery (3.7v LI-ON poly) to install in your project. you can power an led, keep in mind the voltage output of the batter when choosing your LED's. USB charging board turns charging off when the battery is full
1583486
1. This unit is for charging a single battery. 2. A single lithium battery will likely burn out a LED.3. Get an LED driver made for a lithium battery's that is rated for the LED you intend to use.4. A small Buck Boost: step up or step down unit is probably what you need.5. A current limiter is another option you can use a resistor to limit current flow in to the LED. Most LED's use very little power.
2098868
That would depend on the output that the battery puts out. If the power goes more than 3 Volts then the LED would need resistor.
1599228
The battery needs to be discharged a bit before it draws enough charging current to light the LED.
1420103
I don't know which would work best. I am not happy with the ones I bought. I bought the ones shown with it. The led lights are not pleasing and they use up batteries. I don't even turn them on any more.
1770806
This is a 120 volt system. You'd need a step down transformer as well as a bulb adapter. If you want LED, buy something designed for it.
82459
Naw it wont work like that u need to run a pos to it then ground the one off to the side to make the led work if u do it ur way the led wont even come on
1632988
yes, it should work fine,Leds are very low amperage, you might have to use a resister to limit voltage depending on the LED Rating.
2062836
I don't think you can. But doesn't costume power and LED should las very long. Not sure I wish I can answer that question better
535766
If you are charging the battery from empty, when you plug it in only 1 light will be blinking. After some time charging, it will be 2 (1 on, 1 blinking), then 3 (2 on, 1 blinking), then 4 (3 on, 1 blinking). After some time all of the lights will go off. That is when it is done charging. As this is a high capacity battery and usb is a low input source, it takes a long time to charge (as would any other backup battery that's charged via usb). Just give it time.
703366
More than likely. I set up a Li-Ion battery this way and it worked fine and gives a few hours of light.
1178728
yes you can since the maximum output power of this specific battery is = 125 x 11.1 = 1387.5 W = 1.38 kW and since the light you chose is operating on 12V so you are good to go :)and i think this will give your light something between 40-50 minutes of continues discharging until the battery reaches 9.6V which is the minimum voltage you can reach without harming the battery
1485988
Yeah. If the battery gets used up just plug it via usb to your computer, 115vac, car usb converter...Lights go all disco too. Pretty cool imho
1665887
A very yes, but do not get in a hurry. Also make sure your battery is not so out of date, and a build up of sulfate. This is a smart charger, and the LED says no, do not do it! Also, note that a cranking battery that is often deep discharged or not used on a regular basis will die before it's time. WA4MUC
963696
You should be able to but it will drain the battery pretty fast .I would suggest putting several in parrel that means connect all positive post together and same for negative that will give you more corrent and a longer run time hope this helps.
1060823
look at it like this . a regular battery charger has a lot of power. a nice powerful solar cell will hardly light up a flash light bulb. the only way a solar cell is going to charge a battery is over a long length of time as a trickle charge. the trickle is relatively so small that it really does not matter if you put 12 or 24 volts on the battery. it's still a trickle. i put six solar cells (powerfull ones) on one battery. it charges faster but there is really just not enough power to fry a car battery. just make sure your diodes are good so that the battery will not discharge over night. the answer is yes though, and the more the better, and forget v. & i. regulators unless you have a yard full of cells again you are not generating that much power, probably, if you are like me. - i like all paralel at 12 v. though. i have no need of a 24 v. source.
982892
you can run these straight to positive and negative to battery or you can use switch. thanks.
771503
This is just a guess, but LED light technology is such that the light will still work even if there is just a little power remaining. There just might not be enough power left to charge your device. It's possible that you just have to re-charge your battery by plugging the micro-USB cable into the battery and connect the other end to a power source. If that doesn't work, contact the manufacturer.