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mandobrit
USB Problem
mandobrit

I thought a USB was a USB, but I ran into a problem of conflicting stories: I updated an existing electrical receptacle with an Eaton wall receptacle with two AC connectors and two USB connectors rated 5V 3.1A.

I purchased an LED searchlight with a USB charging system rated 5V 1.5A:
http://www.lightingever.com/10w-rechargeable-led-spotlight-portable-3300006.html

The conflicting ideas are, the searchlight company tell me I can't use the wall charger I purchased, because the amperage of the USB receptacle is twice the searchlight amperage.

I read on the internet that it doesn't matter:
http://www.extremetech.com/computing/115251-how-usb-charging-works-or-how-to-avoid-blowing-up-your-smartphone

Then I read that Leviton make a USB receptacle with a Smartchip that recognizes the Amperage and makes adjustments. Unfortunately, my receptacle is made by Eaton.

I am so confused, I need some answers, please. Thank you.

Re: USB Problem

If the devices were designed properly the wall chargers would be fine with any device. Just like you can plug a lamp that draws 1A into a 20A residential circuit.

But, if the flashlight folks say no, it's probably because they have a poor design.

They probably don't regulate the charging current to the Li batteries so they could overheat or catch fire.

Brad
Re: USB Problem
Brad

The usb output amperage is a maximum amperage not a charging rate.

keith3267
Re: USB Problem
keith3267

The receptacle is a source that can provide a maximum of 3.1 amps at 5 vdc. It will actually supply what the load (device) can take, no more. The only way it could provide more amps is if the voltage is increased. But it can only provide up to its maximum. The problem would be if the LED searchlight needed 3.1 amps and the outlet could only provide 1.5 amps.

In other words, a quart container can fill a pint container, but a pint container cannot fill a quart container.

Mastercarpentry
Re: USB Problem
Mastercarpentry

The outlet capacity doesn't matter as long as it is enough to meet the minimum that the device requires. That is a long-proven principle of electricity. I'm a certified portable light nut (we call ourselves "Flashaholics") and a Ham radio operator so Ithoroughly understand the chargers and battery technologies involved here :cool: If your light instructions tell you otherwise, something screwy is going on and I wouldn't trust them or this light.

Your spotlight could be OK or it might lead to some really nasty problems. There are thousands of lights being made by hundreds of different factories and many of the chargers and/or cells are unsafe. Many of the claimed certifications are faked as most manufacturing is intentionally cheapened to maximize profits. The reason this situation exists is that nearly all portable lighting is now made in China whose laws practically prevent their people from being held liable for anything. Adding to the dilemma is that our systems of consumer protection (the U.L. labs, Customs inspections, etc.) cannot keep up with the flood of products coming in. You are on your own regarding electrical and electronic products coming from China these days which means nearly all of these things. If a charger,cell, or battery is LiIon you had better research it well for those can burn your house down, explode, permanently ruin your lungs, or even kill you when things go wrong :eek:

Not knowing exactly what light you've got I can't say with any certainty that it's unsafe, but the odds are that even if it is safe, it isn't going to give you the service or lifespan you expect. Join us over at the /http://budgetlightforum.com/ and we can answer any questions you may have regarding modern portable lighting ( I'm "SawMaster" over there) or PM me here and I can check out what you've got for you. Most of the rechargeable spotlights are essentially junk. I've got a pocketable flashlight which shines farther than almost all of those do and a slightly larger one which certainly will (I've tested that one at a full mile and it has more to go). We're rabid about getting you what you're looking for safely and as cheaply as is possible over there and we don't mind newbies :)

Phil

Banterers
Re: USB Problem
Banterers

Like other folks in the thread said, it will be fine as long as the USB outlet outputs MORE than the required amperage amount used by whatever device is plugged in.

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