Lithium Polymer Battery Fault In Blue Tooth Speaker
A guy who works in s super market next to my shop brought me this blue tooth speakers for repair. They were completely dead and when I tried to charge them, they did not charge.
There was no charging light and it was time to take it apart and check it out.
As I took the blue headphone pads off and three screws on each side, I was able to see inside this headphone and proceed with testing.
I tested the input voltages and I was getting 5 volts there which means, the charger, the charging ports are ok.
So the next logical step is to check the voltages at the battery area.
When I tested there, there was no voltage reading whatsoever.
I took the battery out and checked it with my multimeter and I did not get any reading there indicating a bad battery.
These kinds of lithium polymer batteries are very hard to find locally but I remembered I have one in my shop taken from a broken remote controlled air plane that uses such batteries. The value of it is 3.7 volts.
It was perfect replacement for this headphone because the moment I solder it to the board, the head phone light was on and I was able to charge it.
I put everything back together and I shouted to the guy next door, who was waiting impatiently for the repair to come and see. He walked in the shop while I had his headphones on my ears listening to music. You should see the reaction on his face because he was not expecting to see his headphone alive again.
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.
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Jestine Yong works as an Electronics Repair Lecturer in Kuala Lumpur Malaysia and his training website is http://www.NoahtechElectronicsTraining.com. You can check out his repair blog at http://www.JestineYong.com
6 comments on “Lithium Polymer Battery Fault In Blue Tooth Speaker”
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It is always a good thing to have spare parts laying around! Good job!
Albert: thanks man. Have a blessed day
Is there anyway to REALLY test if a battery is bad or going bad? Sort of like the way we check the ESR value of e-caps? I have a battery pack which goes to a large bluetooth speaker. It consists of 3 cells but i’d like to test which cell or cells are bad. Measuring the voltages often doesn’t reveal a problem if one exists.
Tayo: in my case the battery was buffed up so it was a clear indication that the battery needed replacement. in your case if you have three cells, I would separate the cell under test from the other ones and test it, it should give you the value of the battery written on it or close to it. if I were you, I would replace the whole three cell battery, it is much better that way. have a blessed day
Vow! Another interesting device set right in a professional way! That too with no external purchase! That calls for a celebration of a kind!
Parasuraman: the a look on the customer’s face was a good celebration for me. have a blessed day my friend.