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I have this cheap 2S BMS board that I want to use to charge a 2S 18650 battery pack (two 18650 in series.)

Can I use this BMS board with a 9V wall adapter to charge my battery pack? I want to make a portable battery pack for a school project.

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No you must have a battery charge controller that is suited for lithium ion batteries.

Just connecting a voltage regulated power supply to a battery pack with BMS will result in an incorrect charging cycle and incorrect voltage to the batteries. Most batteries need a constant current charging cycle then constant voltage charging cycle, which a battery charging controller provides.

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  • \$\begingroup\$ but i have seen a lot of videos you tube , guys doing it but it's sad nobody told this truth, Thanks man, can you please mention what i need to do to make a portable/rechargeable 2s 18650 battery pack without asking me to post a different question :-) \$\endgroup\$
    – usmandroid
    Jul 1, 2021 at 5:31
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For charge it, i recommend using 2s charging module, i dont remember its model But it had two mode, 1s and 2s battery charge And then you can just charge it with 12v or maybe 9v wall adapter

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    \$\begingroup\$ Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center. \$\endgroup\$
    – Community Bot
    Mar 15, 2022 at 8:23

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