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Battery life is one of the top concerns for Bluetooth speaker buyers. Most manufacturers list playback time tested at medium volume. If you turn volume up to maximum, actual playtime will drop obviously.
Most speakers use USB-C charging port nowadays, faster and more convenient than old Micro USB. Some big party speakers support reverse charging to power your smartphone.
Battery tips: Do not keep charging all night for months. Avoid storing the speaker in extreme hot or cold environment. If you do not use it for a long time, charge it to 50% every 2–3 months to protect lithium battery.