If you want a 24V battery pack, you can connect six 18650 cells in series. To calculate the capacity, you need to multiply the capacity of one cell by the number of cells in parallel. For example, if you use four cells in parallel and each cell has a capacity of 2500mAh, your battery pack will have a capacity of 10,000mAh.
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Best solar power banksBioLite SolarPanel 5+ Capacity: 5W, 3,2000mAh Compatibility: 1 USB-A port . Anker PowerCore Solar 10000 Capacity: 12W, 10,000mAh Compatibility: 2 USB-A ports . Hiluckey Solar Charger Capacity: 25,000mAh Compatibility: 2 USB-A ports . 4PATRIOTS Portable Solar Power Bank Capacity:8,000 mAh Compatibility: 2 USB-A ports .
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