Changing 3.7v battery for a 4.2v battery

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#1
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Hello, everyone.

 

My Bluetooth speaker, which had an integrated 3.7v battery, died and ceased working.

 

The speaker does not work on its own when plugged in, presumably because the battery is dead.

 

I went out and got a 4.2v battery to replace it. The initial battery charge worked and kept the speaker working for a while until the charge was gone, at which point I attempted to charge the speaker via the USB port designated for charging, but it failed.

 

The store where I bought the battery claimed that switching between voltages was not a problem, but it appears that it is. Is there any way to solve this?

 

I've read some tutorials like https://www.kynix.com/Blog/The-B..., but I still have no idea.

 

Any ideas would be greatly appreciated.

Last Edited: Wed. Oct 13, 2021 - 07:12 AM
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Welcome to AVRFreaks!

 

From what you said, it is obvious that one, or perhaps both batteries are of Li-Ion type.

Can you post the battery data and size, old and new one, please.

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Yehuda wrote:
The initial battery charge worked and kept the speaker working for a while until the charge was gone, at which point I attempted to charge the speaker via the USB port designated for charging, but it failed
Did you checked the USB port cable properly(Voltage and ground cable) ? 

www.tokopedia.com/madagang cheap and free worldwide shipping

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Why did you join AVR Freaks today for this---you should join an audio or battery forum.

 

The battery could be dead because something is wrong with the charger...so the battery went dead.

Now you have a new battery, and finally it is dead too.'

 

The speaker is likely junk, unless you have some electronics repair experience.

 

Li-ion batteries often charge to 4.2V when completely full to the brim & then run mostly around 3.7V ...so the advice was probably correct.

 

Get yourself some good speakers...you will be glad.  I have a pair of these infinity reference standard speakers, though my wife moved them into a storage room!

 

 

 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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avrcandies wrote:
I have a pair of these infinity reference standard speakers, though my wife moved them into a storage room!

 

No she hasn't - She's put them on EBAY, and for a tidy price of $3,000 too.

 

https://www.ebay.com/itm/Awesome-Infinity-Reference-Standard-2-5-Floor-Speakers-RS-2-5-Reconditioned

 

Last Edited: Tue. Oct 12, 2021 - 07:37 AM
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Yehuda wrote:

...but it failed.

 

I'm not surprised. The charger will be designed for the 3.7V battery and will stop charging when it reaches that voltage to prevent damage to the battery. Replace it with a 4.2V battery and it can never reach the 4.2V needed to charge that battery.

#1 Hardware Problem? https://www.avrfreaks.net/forum/...

#2 Hardware Problem? Read AVR042.

#3 All grounds are not created equal

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#5 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand."

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N.Winterbottom wrote:

No she hasn't - She's put them on EBAY, and for a tidy price of $3,000 too.

 

https://www.ebay.com/itm/Awesome-Infinity-Reference-Standard-2-5-Floor-Speakers-RS-2-5-Reconditioned

Wow,very expensive.

www.tokopedia.com/madagang cheap and free worldwide shipping

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Heh. I must have bought a thousand of these BBC designed speakers over the years designing studios: https://www.ebay.com/b/ls3-5a/bn...

 

I'm damn sure I didn't pay anything like what some of these jokers are asking, though!

 

Neil