2-Way 18650 Battery Holder (DFR0969)

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This easy-to-use 16850 battery holder with dual-slot offers micro and type-C charging inputs, five 5V/2A output ports, five 3.3V/1A output ports and one…

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I’m considering using one of these to power a portable speaker. Would the battery holder need to be turned on each time the speaker is used even though the amp has its own power switch? Many thanks for your assistance and patience with a total beginner. :slight_smile:

Depends on the portable speaker.
If it has a 5V power connection and an audio input connection then Yes.
These devices will have an audio power AMP built in which needs power to work.

If it is just a speaker with only audio in then you don’t need the battery holder at all.
Can you post a pic of the portable speaker connections and the AMP; that way we can give more accurate advice.

The output of an audio power AMP will damage the audio input of a portable speaker; if the speaker has its own power AMP.

Regards
Jim

Thanks so much for your prompt response, Jim. I’m actually looking at using the DF Robot High Power Amplifier listed on this site. I’ve chosen this amp board specifically because of the integrated power/volume knob as it will work for a key design feature of the housing I plan to build. However, I’d rather avoid having to have two power switches. I can’t seem to find an 18650 battery holder on your site that has an in-built charger without also having its own dedicated power switch. Grateful for your advice.

@Abby262255 that makes more sense now.
So the battery holder is to power the AMP and audio comes via the bluetooth.
The AMP has an integrated on off switch / volume control and the battery holder has a push button switch. The battery holder has a auto shutdown feature where it will switch off if the current drain fall too low. (120mA or 40mA) So when the AMP is not in use the battery holder will power itself off.

I think what you want is a power supply that is basically on all the time, battery powered and includes a built in USB-C charger.

You probably have figured this already, I am just stating for my own thoughts.

The battery holder in this post is not the right device for what you want to do.
The auto shutdown feature is to conserve battery power and protect whatever it is connected to the battery holder. Power banks use a similar feature to stop trickle charge of a mobile phone, as is not good for the phone battery when it is at full capacity to constantly receive current.

As the AMP will work from 5V to 27V it might be better to look at what is available in a higher voltage range.

The board will output adequate power only when the audio input and power source voltage/current are sufficient. The higher the power supply voltage, the larger the output power. Besides that, speaker impedance also changes the amplifier board power output. Please note that in the case of enough voltage and current, the larger the speaker impedance in ohms, the smaller the output power.

12V–8Ω speaker/24W(left channel)+24W(right channel), 4Ω speaker/40W+40W
15V–8Ω/32W+32W,4Ω/>60W+60W
19V–8Ω/64W+64W,4Ω/>80W+80W
24V–8Ω/72W+72W,4Ω/>100W+100W

At 5V the likely AMP power would be less than 10Watts.

Does it have to be battery powered ??
At high power the battery pack would be depleted pretty quick.
If you can use mains power, a laptop power supply at 24V / 2 to 3A would provide full AMP power.

Hope you can find a solution, depends on what you want the AMP to do.

Regards
Jim

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As the amp does not have a power supply, what does the existing on-off switch actually do? If it simply comes out to some wires designed to connect to the external power, then the task is simply choosing the right battery.

Note that your application does not require a regulated supply. Including the regulator wastes battery power and makes it more difficult to get to the connection to the battery to completely isolate it when the amp is turned off.

If I was doing this I would use a pair of 18650 in series for 7.4V and a separate BMS module, with the connection to the battery wired through the amp on/off switch. But that might be a more extensive construction than you want to do.

For example:
2 Cell 18650 Series Batteries Holder
2S 3A 18650 Protection Charger Board

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Hi there! I looked at the specs but wanted to confirm - how do I connect this to my Rpi Model 4B+ in order to supply power to the Rpi? Can I do it via the USB-C connector, or do I need to solder things?

USB-A to USB-C cable. The USB-C port on the Pi 4B+ does not use USB-C PD, so normal cable is ok.
(the Pi 5 needs a USB-C PD supply)

Regards
Jim