"What's wild about this jump in stamina is that it's disproportionate to the battery's capacity. The Kilburn II ships with a 5,200 mAh cell, while the new model is only about 5% bigger: 5,500 mAh. Clearly, some big efficiencies have been gained."
"When the speaker is powered on, charging flows outward to phones and other accessories. However, when the power is off, the speaker will draw power from them. The Kilburn won't automatically power off when a USB device is connected, but if you turn it off manually, your phone will drain instead of charging."
"To help extend the battery's lifespan, you can enable up to three preservation schemes in the Marshall app: setting the maximum charge to 90%, adjusting the charging speed in hot and cold conditions, and capping charging speed whenever connected to power."
The Kilburn III speaker features a 5,500 mAh battery, only 5% larger than its predecessor, yet delivers substantially improved stamina through efficiency gains. The speaker now includes USB-C charging capability that works bidirectionally: when powered on, it charges external devices; when off, it draws power from connected devices. Marshall offers three battery preservation schemes via app control, including maximum charge limiting, temperature-adjusted charging, and speed capping. The battery is user-replaceable through a bottom access door. Quick charging requires a 30-watt USB-C PD adapter not included in the package, delivering 8 hours of playtime in 20 minutes, while standard chargers take significantly longer.
Read at WIRED
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