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What is back EMF of synchronous motor?

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How to make power bank from laptop battery cells?

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You can make the power bank from laptop battery cells.

Things you need to make power bank from laptop battery cells:

  1. Laptop battery cells (about 6 in parallel)
  2. Universal Dual USB 5V 1A 2.1A New Hot Sale Mobile Power Bank 18650 Battery Charger PCB Power Module Accessories For Phone DIY

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