I'm a longtime OnePlus user - with OnePlus One, 2, 5t, 6t so likely subjective. But the smartphones of this manufacturer are the best for me.
NinjaBatt High Performance Battery For Toshiba A665 And L755 Series - 6 Cells/4400MAh/48Wh
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Rechargeable 12V 3000MAh Lithium Battery Pack: Power Bank For LED Strip, CCTV Camera & More
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