Smartphones use different battery types: Li-Ion (common, high energy), Li-Po (lighter, flexible), NiMH (older, less efficient), and NiCd (outdated, memory effect). Modern phones mostly use Li-Ion or Li-Po for better performance.
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NFC (Near Field Communication) is a shorter range of high-frequency data transferring technology. It is a set of standards for smartphones and similar devices to establish peer-to-peer radio communications with each other by touching them together or bringing them into proximity, usually no more than a few inches.