Question Which is the best alternative to manage the battery source?

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Jan 27, 2023
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Hi guys!

I've been working on a portable trying to spend as less as possible, so i'm wondering which is the best alternative to manage battery power?
I don't have interest in buying custom boards (as the 4layer tech ones) or making my own, so:

-How can I power my regulators using 18650 batteries being able to recharge them?
-Which configuration for the batteries is the best? 1S, 2S. etc.
-Is it possible to recycle a power bank controller, taking 5v for USB directly and also supplying regulators?
(Need to say that the power bank can supply 2.4A for charging and has currently 10,000mAh)

I already have custom regulators for 3.3, 1.15 and 1v and some samsung 3300mAh cells

Thanks in advance
 
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