According to recent FCC filings, the battery for the Switch is similar to PS4 controllers in sense of not being easily replaceable. Also teasing the device won't support 3G nor LTE for Bluetooth capabilities.
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But these documents reveal that there will be Bluetooth available, but will not support 3G or LTE for on the go play (this makes sense for a Nintendo system, and the feature failed on the Vita, so why repeat history). The battery is also supposedly not removable or swappable, and the Switch will support 5Ghz Wi-Fi.
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https://www.destructoid.com/fcc-fili...e-408285.phtml