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

https://au-m.banggood.com/2S-3A-Li-ion-Lithium-Battery-Protection-Board-7_4v-8_4V-18650-Charger-BMS-for-Li-ion-Lipo-Battery-p-1538059.html?rmmds=search&act_poa=SKUC55335&cur_warehouse=CN

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.

You help is highly appreciated and sorry for my weak english.

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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 at 5:31

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