Make sure you have underwater fun all day long. The Sublue Charger Cradle is for the li-ion batteries that keep your Navbow, Swii, and Tini underwater scooters going.
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Love the Tini, and used it a lot on holidays. Too bad the 16.8 charger is not replaceable with a 20v charger as that would make it fit for USB-C charging and reduce the need for bringing along yet another charger. My suitcase is already filled with separate chargers and I'm doing everything to go to USB-c to minimize weight (for when the need is high though it does work to hack it to a USB-c charger, so please sublime, make it happen!)