When using standard BMS, parallel connection of lithium batteries is not acceptable due to very likely damage to the BMS electronics (which may result in damage to the cells).
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In most cases you'll have to wait for the battery to be fully charged up to 100% SOC, for the BMS to correctly balance or equalize the batteries that are connected in parallel.
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The simple rule: parallel increases capacity and current. Series means wiring the positive terminal of one battery to the negative terminal of the next.
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Battery packs are safe when used correctly. However, they can present risks like fire or burns if they malfunction. To ensure safety, follow usage guidelines, avoid excessive heat, and regularly inspect battery packs.
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