Please advise, brothers.

畅畅cc

Please advise, brothers. [Copy link]

 

I have a Bluetooth speaker. I think the built-in battery (7.4V 22.2Wh) is broken. Now I can only use it with a power adapter. I want to take it outside and there is no power supply. Can I use a 12V lithium battery + 19V voltage regulator? The picture below shows the power adapter, the input port of the speaker, and the battery and voltage regulator I bought. Can it be used if it is connected correctly? Regarding the voltage regulator, I chose a 15A one. The seller said, "Our converter current is adaptive. It is recommended that you choose a relatively large A number. The more space you leave for the converter, the better the heat dissipation and life. The larger the A number of the power supply you choose, the smaller the load and the smaller the heat generation itself, the better."

littleshrimp

How many volts is the regulated voltage?

畅畅cc

littleshrimp posted on 2021-3-6 16:31 What is the voltage after voltage stabilization?

19v15a

qwqwqw2088

7.4V lithium battery, is a 2-cell lithium battery, the maximum voltage of the lithium battery when fully charged is 8.4V

畅畅cc

qwqwqw2088 posted on 2021-3-6 21:00 7.4V lithium battery, is a 2-cell lithium battery, the maximum voltage of the lithium battery when fully charged is 8.4V

Did I not ask clearly?

qwqwqw2088

Changchangcc posted on 2021-3-6 22:22 Did I not ask clearly?

It should be

The battery of the Bluetooth speaker does not work and is "broken"

There may be something wrong with the battery protection board.

qwqwqw2088

Disassemble the speaker and look at the size inside. Since you are buying it online, just buy a 7.4V battery with the same power.

畅畅cc

qwqwqw2088 posted on 2021-3-6 22:44 Disassemble the speaker and look at the size inside. Since you are buying it online, just buy a 7.4V battery with the same power

Thanks for your answer. I don't want to dismantle the speaker to change the battery because the built-in battery is not very big. Can I connect an external 12v battery and boost it to 19v, just like connecting a mobile phone to a power bank?

qwqwqw2088

Since it is 7.4V, it must be two lithium batteries in series. The maximum full voltage is 8.4V. Why do I need to charge it with 19V? I don't understand.

畅畅cc

qwqwqw2088 posted on 2021-3-6 23:27 Since it is 7.4V, it must be two lithium batteries in series. The maximum full voltage is 8.4V. Why do we need to charge it with 19V? It's puzzling

The original speaker is 19v, I'm not sure, it seems that it is said that the power of the speaker is greater when plugged in than when using batteries.

qwqwqw2088

Changchangcc posted on 2021-3-6 23:39 The original speaker is 19v, I am not sure, it seems that the speaker is more powerful when plugged in than when using batteries.

No battery inside

To replace the battery with an alternative voltage-stabilized power supply, the load voltage must be adapted. It is recommended that the power supply voltage should not be too high so as not to affect the components in the load, especially the withstand voltage of the capacitor. In severe cases, the components may burn out during use.

It doesn't matter if the output current of the power supply is greater than the load current, because the current is determined by the load.

qwqwqw2088

Changchangcc posted on 2021-3-6 23:39 The original speaker is 19v, I am not sure, it seems that the speaker is more powerful when plugged in than when using batteries.

The original one is 19V, so it can be used. Just match the power.

畅畅cc

qwqwqw2088 posted on 2021-3-7 08:35 The original one is 19V, so it can be used. Just match the power.

OK, thank you brother! Can you see the pictures I sent? The last two pictures are the ones I bought, should they be usable?

chunyang

If you haven't bought one yet, you don't need to spend more money to buy a high-power booster power supply. Just use the power of your power adapter. According to the adapter specifications, 19V/3A is fine. However, it is best to disassemble the speaker and remove the scrapped battery to avoid wasting power. Take a look at the circuit. If the 19V is directly used to power the amplifier, the speaker may be able to use 12V power directly. In that case, the output power will be lower, but it will also save unnecessary costs.

畅畅cc

chunyang posted on 2021-3-8 14:12 If you haven't bought it yet, you don't have to spend more money to buy a high-power boost power supply, just the same as your power adapter. According to the adapter specifications, ...

Thank you for your reply. Because I couldn't find a 19v3a battery pack online, I bought the 12v25000mAh battery and a 12v to 19v15A regulator. The original built-in battery is 22.2Wh, which can last for 3 to 4 hours. Is this better than using the built-in battery? I am not good at doing it myself. I heard that disassembling the speaker will cause air leakage and poor sound quality. Is it okay to not disassemble the built-in battery?

chunyang

Changchangcc posted on 2021-3-10 12:04 Thank you for your reply. Because I couldn't find a 19v3a battery pack on the Internet, I bought the 12v25000mAh battery and the 12v to 19v15A regulator shown above. It turned out that...

Of course you can keep it as is, it will cost a bit of electricity. If you have already sold the power supply, just use it as is, no problem.

畅畅cc

chunyang posted on 2021-3-10 23:36 Of course you can keep it, it will cost a little electricity. I have already sold the power supply, so just use it, there is no problem.