A dead emergency light repaired
These kinds of lights are used in my home town a lot. The electricity goes out very often especially in winter time. Many people buy emergency lights; charge them so they can use them when the power goes out.
It stays plugged in main power which is 220 volts. When the power goes out, this emergency light come on and when the power is restored, light goes off and back to charging. It is a very interesting. The next photos show what inside this emergency light. It is a very easy board and fixing it is easy as well.
From the 220 volts it goes to a (10 AC) step down transformer then to a power board. There should be a 7-8 volts DC coming out of the board to charge a 6 volt battery. This battery is the only power source after the main power is out. Usually when not charging, either the battery is not getting enough power to charge or the battery is dried and not charging any more. Most of the time, the problem in these lights is the battery.
I disconnected the main battery and checked for volt reading there, I got 7 DC volts. According to this reading, this emergency light was working fine and the only thing that is not working is the battery. I tested the battery with a volt meter and it should me only 2 volts which is an indication of a bad battery. As you can see in the photo, it is a 6 volts battery and it should light up to 2 hours when the main power is out.
There is a technique that I use to make sure that only the battery is bad. I disconnect the light from the main power and then add a 6 DC volt power source to the main black and red wires. If everything is ok, the light should come on and that is exactly what happened giving me the assurance that the battery is dead and need replacement.
I replaced it and sure enough, the light came on. For your information, these kind of batteries need to be charged at least 11 hours before any use. If batteries were not charged 11 hours, they will not last long.
Mission accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment. Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
By the way if you have any good repair article that you want me to publish in this blog please do contact me HERE.
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Gopal Sharma
August 9, 2013 at 8:21 pm
Thanks, i didn't know that battery should be first charged for 11 hrs otherwise it will not long last. Is it true? Please tell me in more detail and how much to be first charged for 12v ups battery.
Mzwebandla
April 29, 2022 at 3:50 pm
Hi I have gama sonic emergency light.it has been long time not used now I want to use,when I plug it in power it doesn't show that it is changing please help
Amir Mukhtar
August 9, 2013 at 11:23 pm
Sir jestine and Mr. Waleed
Thanks you for your great pasion to provide learning sources to students.
thanks you
Amir Mukhtar
Waleed Rishmawi
August 10, 2013 at 3:32 pm
this is a factory recomended charging. it depends on what kind of battery you are dealing with. usually the makers of the battery give your recomendation on how many houre you should be charged. from experience, I had so many people come to my shop asking me why the battery does not last for two houres as it says in the light user manua. when I ask them how many times they charged it for, they say, half or one hour max. another people they are satisfied with the operation simply because they followed the recomendation of the company.
مروان
March 4, 2014 at 2:16 am
Charging the battery - should not be more than two hours only
مروان
March 4, 2014 at 2:24 am
If you want to prolong battery life. Rode regulator 8 volts. Three parties will send you to a picture
مروان
March 4, 2014 at 5:35 pm
No problems with the original hardware because they stop overcharging. Regulator used to charge the battery. Because it stops charging when the battery becomes full. Do not want to overcharging. Problem here Come overcharging damage the battery components, especially the liquid material., And dry them
مروان
March 4, 2014 at 5:52 pm
How do I download pictograms
Ronald Thomas
April 25, 2014 at 3:51 am
Good day . I have two of these lights and both batteries are dead and instead of discarding them I would lik to re purpose them for aquarium lighting. The problem is I'm not sure how to bypass the battery. Can you give me some advice.
Sherwin Baptista
May 8, 2014 at 4:18 pm
Good day,
You would have to use an(SMPS)based power supply similar to the battery specification.
Grag
December 7, 2015 at 5:43 pm
Thanks! Good article! Is it true that all emergency lights can work only 3 hours and then should be charged? And what I should do if there is no electricity more then 5 or 7 hours how to deal with it? Or maybe there exist power station that can maintain viability of light. I think that van lien hardware.be/noodverlichting/van-lien produces good products but i'm not sure that it can work more then 3 hours at least!
Afzal
May 11, 2016 at 2:56 am
Hi
I have 6v rechargeable fan.
My fan stoped automatic switch on/off system when we switch off 220v ac plug
(Once i put my battery connector to 12v high amp battery which was connected to ups)
Can u plz help me to rectify this problem
Alvin
July 15, 2017 at 12:49 pm
What is the problem of emergency light which output voltage is too high about 40 vdc and which may battery only 4 volts
Alvin Avarachan
October 29, 2017 at 12:24 pm
Sir,
I have a doubt. I have an rechargeble emergency light. During charging a red led wil starts glow. But nowadays it shouldn't glow during charging.I checked that red led. But there is no problem for it.Now the total power of light will reduced very much. So will u please help me to solve this problem.
I am waiting for your answer.
Rummana Moledina
October 13, 2020 at 6:08 am
Hi, Have a 2 tube BPL emergency light ... 6v 4.5/5Ah. Please let me know why my cfl tubes remain lit even when the mains power comes back. Are they working directly on the mains power ... then why do we need a battery. Or are they duscharging battery even when power is on and the battery is charging?