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I am making a battery charger for a speaker using 4 18650 3.7V batteries.

Now I know that I would need to get a 4S Lipo or Li-ion PCB, the only thing I don't understand is the current rating that I should get.

Like, for example, would getting a 30A 14.8V PCB board cause an issue somewhere?

Also since the voltage of the battery board is 14.8V, would I have to go a little beyond for the DC charging port and its charger?

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  • \$\begingroup\$ Many things can cause issues and you question is light on detail so this cannot be answered. \$\endgroup\$ – Andy aka Jun 26 at 9:43
  • \$\begingroup\$ Ah I apologise, but the design will be similar to something like this: i.stack.imgur.com/LK15V.jpg gyazo.com/8f8f1009b7dbd68d6bd0bcb07302437a gyazo.com/d9a6a47ba4df2881c697fd2297cd803c Ignore the numbering on the power adapter since I got this from someone else, but it is similar to this concept. The voltage rating on the Bluetooth amp that this will be connected to is 12V, the only thing I don't understand is whether 30A is too much to be connected to a circuit like this, also would this mean I would have to get a 14.8V to connect to the dc port to charge? \$\endgroup\$ – Thanos Jun 26 at 9:52
  • \$\begingroup\$ I work with data sheets, specifications and proper schematics so I can't help this time. \$\endgroup\$ – Andy aka Jun 26 at 9:59
  • \$\begingroup\$ Ok no problem but thank you for the advice \$\endgroup\$ – Thanos Jun 26 at 10:00
  • \$\begingroup\$ What do you mean by "30A 14.8V PCB"? Are you talking about the BMS for the 4 individual batteries? \$\endgroup\$ – Jay Jun 26 at 12:41

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