DIY Bluetooth Speaker: Power Supply, 12V Battery, Amplifier, Inverter & Stabilizer Options

Hello !!!
I have a question about bluetooth speaker power supply. I was inspired to make my own speaker, I searched on forum and youtube and found a movie (I added the title to the attachment because I can't add links to posts yet)

I found this video and I want to do something similar but I would like to change a few things and now I have some questions.
1. Can I put batteries into the basket instead of the modeling battery so that this 12V comes out and connect it all in series to the amplifier
And the second question is whether instead of this stabilizer I can use such an inverter from the charger to the cigarette lighter there I have 2x USB
And I also wanted to ask if this question batteries are suitable or better to give it a rest (photo of the battery also in the attachment)
This will be my first project of this type so I don't know anything about it, but there are willingness, thanks in advance for any help.
Please, if you have any other suggestions please write

https://www.olx.pl/oferta/testowane-markowe-akumulatory-li-ion-typu-18650-CID99-IDhih2J.html

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https://youtu.be/HpE9Bgw-BPQ

Patelniak20 wrote:

Instead of modeling battery, can I throw batteries into the basket so that this 12V comes out and connect it all in series to the amplifier

You can if:
- the batteries have adequate current capacity
- you will charge them with an external charger after removing from the basket
Note that batteries after PLN 2 in many cases are only suitable for the bucket with the words "Waste treatment".

Patelniak20 wrote:

And the second question is whether instead of this stabilizer I can use such an inverter from the charger to the cigarette lighter there I have 2x USB

In principle, only a converter will be suitable for battery operation, a linear stabilizer is a conceptual error - wasting limited energy.
As above - check if the converter will "leak" in current.

Patelniak20 wrote:

And I also wanted to ask if this question batteries are suitable or better to give it a rest (photo of the battery also in the attachment)

What is "pyt"?

In that case, what do you think will be best to power such a speaker so that I do not have to remove the battery every time?
I wanted to use 2x15w speakers but I need a big battery to play a few hours.

I obtain 18650 cells from "broken" laptop batteries. After dismantling several batteries, it turned out that a maximum of two out of six cells are useless or all functional and electronics free. I power them with a demanding SSTC and metal detector. They really do well. Charging off device.

Patelniak20 wrote:

In that case, what do you think will be best to power such a speaker so that I do not have to remove the battery every time?

Either a single lithium cell or a pack of lithium cells connected in parallel. Or the cells connected in series with the appropriate balancer added.

Patelniak20 wrote:

I wanted to use 2x15w speakers but I need a big battery to play a few hours.

What amplifier?

Patelniak20 wrote:

I wanted to use 2x15w speakers

This information says nothing about energy demand. It is important what power and in what class (AB or D) you plan to use the amplifier. This amplifier draws power and the speakers can have even 1000W - at most they will not play their full potential.
Enter the amplifier model and speaker resistance.

398216 Usunięty wrote:

Patelniak20 wrote:

I wanted to use 2x15w speakers

This information says nothing about energy demand. It is important what power and in what class (AB or D) you plan to use the amplifier. This amplifier draws power and the speakers can have even 1000W - at most they will not play their full potential.
Enter the amplifier model and speaker resistance.

2x15W PAM 8610 class D amplifier
Added after 2 [minutes]:
And could the battery from the old tablet be used? I mean, I don't have to take it out every time I want to charge the speaker.
The battery from the tablet has 5V / 2A. 4000mAh

Patelniak20 wrote:

2x15W PAM 8610 class D amplifier

What speaker impedance and what voltage do you want to power the PAM with?

Patelniak20 wrote:

The battery from the tablet has 5V / 2A. 4000mAh

Certainly not enough, because there are one or two lithium cells.

Unless I should buy some other amplifier

Patelniak20 wrote:

Unless I should buy some other amplifier

Each 15 W amplifier in the channel must be supplied with at least voltage = 12V.
Less voltage means less power. It would be possible to give a converter increasing the voltage, but this in turn is a larger current (the product of U * I must be preserved - plus losses), and therefore shorter operation ...

And if such a battery is suitable to power the speaker, I wanted to try connecting 2x50w speakers but I do not know what amplifier to choose

These are two pieces of lithium cells 3.6V each, so they will give 7.2V in series.

Freddy wrote:

These are two pieces of lithium cells 3.6V each, so they will give 7.2V in series.

Yes, but is it enough to power two 50W speakers?

Have you read all the previous posts and understood them?

Freddy wrote:

Have you read all the previous posts and understood them?

I doubt it ...
So I will ask - how do I write so that the meaning of post # 7 arrives?