Inside a solar charged LED lamp.

A take a look at the extremely simple wiring in a solar powered LED lamp that has a detachable solar panel that is used to charge the lamp for later use.

The resistor steps around 5 ohms (significant 4.7) as well as the voltage decrease throughout it varies from.6 to 1V approximately depending upon the lithium cell’s cost state. That offers a present of around 100 to 200mA through the 12 LEDs so usually concerning 15mA per LED.

Comments (50)
Darrin Houdek
July 6, 2017

Hello I have one of those led lights with the phone battery and was wondering if there is a way to swap the switch out with a photocell so it comes on by itself in the dark?

Ondrej Janovec
July 6, 2017

I wouldn’t consider this circuit as safe.

Leroy Baker
July 6, 2017

I’ve been wanting to build my own solar light, i couldn’t decide on a battery…. problem solved.

Owen Attard
July 6, 2017

Hmm.. this had me thinking.. I have a spare Samsung 7Ah Li-ion tablet battery and those 0.9V to 5V buck converters with USB port sold on ebay which I can make it into a high capacity OTG charger. Would I need to down the voltage to 4.2V in order to charge the battery safely or will a 5V source be enough and the protection circuit on the battery saves all my efforts? Thanks.

Obliterous
July 6, 2017

chinesium at its best!

micheals1992
July 6, 2017

these would be good for lighting in a tent while camping

Joe Explores
July 6, 2017

Years ago I made an Arduino little tank bot powered by 4 of those phone batteries. The robot has a top shelf spot in the book case and still works after years. I charge him with an old blackberry charger

Grizzly Moo
July 6, 2017

I use a torch to jump start family solar lights lol

Adam Oliphant
July 6, 2017

As soon as you said the rating on the solar panels output, I said to myself "hmm, isn’t that on the low side of what you’d use to charge a phone battery?" and low and behold, it’s got a cellphone battery in it. Fascinating kit of parts though, it’d be fun to reuse it for something else.

John D II
July 6, 2017

Just got 2. Mine have the metal hook hanger, a USB Micro plug and LED charge indicator. I am playing and found I can charge the lamp or my LG phone under a 60 watt equivalent LED lamp. Box says it is equivalent to a 15 watt incandescent lamp, it has a 850 mA 3.7 volt battery and runs 5 hours.

Phil Sierra
July 6, 2017

The cell is a generic Anycall-brand Samsung cellphone battery.
It is used for older mobile phones with fixed functionality.

Guthery Life
July 6, 2017

Do you know if this light is still charging even with the power on?

Seán Byrne
July 6, 2017

Even if the cell does not have internal protection, its lower and upper voltage will still be limited to an extent with this circuit – The maximum charge voltage will be limited by the voltage after the diode, so probably 4.4V (5v from cell minus 0.6v for diode.) This is not high enough to cause most Lithium Ions to self-destruct, although it will severely shorten the life. If the light is left switched on, the minimum voltage will be the point where the LEDs no longer conduct, i.e. just below 3V. Lithium Ion batteries generally survive being discharged to 2.4V.

макс сычев
July 6, 2017

tell me please about capacity of li-ion battery?

Lumen Tech
July 6, 2017

Mr clive..this kind of batterys ar getting fat and damaged in 2 months by useing..why its happend I don’t understand can you say about it,,?

Admiral Preparedness
July 6, 2017

I have one of these coming in the post and I wanted to thank you for taking one apart so I don’t have to. Cheers!

RFC3514
July 6, 2017

2:40 – Could be taken out of context.

zx8401ztv
July 6, 2017

Thanks for the dissasembly clive, my mate has one of thease, now i know how it ticks 🙂

Daniel G
July 6, 2017

I have a pile of old Galaxy S3 batteries, six of them I believe, which I don’t need anymore. I’d love to repurpose them into a USB battery charger for my newer phone!

I wonder if I could splice together a circuit in the old battery charging cradle to output 5v usb or if a preexisting solution already exists.

Joe Explores
July 6, 2017

Very cool break down! Best regards, joe

Ben Beyond
July 6, 2017

Can some one help me hit 100 subs

233kosta
July 6, 2017

7:24 Does anyone actually run solar panels in Scotland?

Federico Echeverria
July 6, 2017

hi, i saw this same item and the seller ln ebay claims that it works at 5V 15 Watts. do you think thats possible? thanks

Doazic
July 6, 2017

Hey how would you go about testing a solar cell if you don’t have a multimeter with you? Ideally with something you’d find in a normal household.

Richard Ball
July 6, 2017

I made an ht battery for valve radios when sainsburys sold off a load of Nokia nimh batteries at 10 or 20p a pop. Soldered straight onto the pads.

karzygijose
July 6, 2017

Have you ever done a test of the solar panel? Of current

Jeason Lee
July 6, 2017

This is my aliexpress store :www.aliexpress.com/store/1884024, it has many high quality led products.If you need the LED product,you can view it

karzygijose
July 6, 2017

Did you happen to find out how much current the solar panel gives? or the run time?

I want to do a Wishing well Flower potter and using one of these per flower potter but want to make sure it lasts around 13-14 hours or even 24/7 with the solars producing more current then the battery is discharging

leosedf
July 6, 2017

I think there is no protection on the battery, it only may have high discharge rate protection . The third pin is only one NTC resistor and that’s it.

Karlito Serrano
July 6, 2017

Hi Clive, I bought those lamps too and I want to use them in my greenhouse just to see where I am going 🙂 Can you tell me how you connect 3 of those lamps together with a switch at the entrace of the greenhouse? And how we can charge them when connected all together? Thanks

anamul arefin
July 6, 2017

I want this circuit board design with diode no and resistor value and color code …..battery volt. thanks for this video

Ulfgar-Septimus von Stahlenberg
July 6, 2017

Oh wow… I could make some myself. I have some batts arround here. Never thought this would work.

twilsonscreamer
July 6, 2017

wouldn’t the LEDs heat up that battery and basically use it as a heatsink? seems weird to have the battery so close to so many LEDs

Vicu Dobre
July 6, 2017

hi. I like to get same advice from you .how to get in touch

lee x
July 6, 2017

That was a surprise and very different and simple way to run one of them lights with a phone battery

Angel Rivera
July 6, 2017

i have done it a lot .. and they are really usefull source of rechargeable energy , i have use them a lot with one of your circuits too, the simple solar light , and they work great with a 1w led , the best part of them is that i get a lot of them for free at the celular repair shop , if they dont show Voltage is just the recharge protection circuit and in that case i just use them straight from de conection and use a zenner 🙂 , nice video , i like all the one that u do with solar power and lights.

K3YSP3R
July 6, 2017

I minute I see the phone battery, I spill my drink. shit.

Fueler
July 6, 2017

Anyone in the L.A. area know any stores where these are sold ,especially around downtown?

SeanBZA
July 6, 2017

Now you know where all those old phone batteries go when you put them in the ewaste bin. Next lamp will have another totally different one.

muh1h1
July 6, 2017

i don’t really believe that there is any protection inside the cell, probably they figured the current of the cell is so low, it is not going to make the lithium cell go boom, so they ditched expensive protection…

Futz With
July 6, 2017

Mine came dead as well, but charged enough to turn on very quickly.

CoroaEntertainment
July 6, 2017

What was the battery’s mA capacity for the one you received? Also, how long would it take to fully charge the battery from a dead state (in full sun), and how long will the bulb stay lit with a fully charged battery? Thanks.

PIXscotland
July 6, 2017

I do that with those batteries. Buying these on Ebay is so cheap. Even if they’re fakes I’ll take the small risk of (catastrophic) failure.

I did experiment with charging an 18650 using a mosfet switch to enable the charge. I used a 1ohm resistor to limit the current. My wee 6v@60mA cell charged the battery well, too well though. I forgot about it for a few days and the cell was sitting just over 5v. Thankfully it was a cheap/crap face Ebay one.

bluephreakr
July 6, 2017

How many of those phone batteries could be stuffed in that case? If you can find a bunch for cheap, you can have that lamp last absolutely forever, just keep the solar pad in the sun to charge before the worse happens.

erick sal
July 6, 2017

I have a 5 watt led bulb, that gives out 55 watts of lumens, I want to make a rechrechargable battrry bank to hook it up to, solar that iis, so my questioquestion is, if the bulb iis 5 watts, and a standard 1.2v double as battery has about 3 watts in it , two should make 6 watts. Shouldnt that be enough to power the bub, its obvious thathat the bulbs resistor and capacitor are made for 120/220 current, so there may lie my problm, I thought since it consumed 5 watts a 9 volt battery would light it up , but doesn’t work, so heres my question, how many 9 volt or As batteries do I need to light it up, tia

Wang Danaa
July 6, 2017

nice,I have this product Solar led bulb; http://www.dhgate.com/store/20458123

Land Rover Addict
July 6, 2017

Hi Clive I wonder if you could offer some advice? I have a small Solar light with a 1.2 volt nimh battery. I want to swap the battery for one with a higher capacity. To charge the battery I want to add an additional 1.5v solar cell in paraell with the built in solar cell. Can I simply add the additional cell by soldering the +ve and -ve of the two solar cells together? Or do I need to add any diode protection to the second solar cell? Your advice would be very much appreciated.

Blahblox Gyuanox
July 6, 2017

I just buy similar lamp for 1$,and try to open,i think the mat bulb is plastic but dont and glass break hurt my hand.8)

Joseph Rotello
July 6, 2017

Where in North America or World is this particular solar charged LED lamp available ? Might be an interesting item to use or further manipulate to fit for a particular need.

MyBigThing2010
July 6, 2017

thanks for taking this apart…it’s been a candidate for a hack for a little bit. …now I can make better decisions on the project

Stay up to date
Register now to get updates on promotions and coupons.

Shopping cart

×