Batteries don't tend to degrade like they used to. The chips that charge and discharge them are a lot more sophisticated. Most batteries do well for 2.5-3 years these days.
Re:Nintendo Switch review: pure potential
by wodenokoto on Wednesday March 01, 2017 @12:40PM
(#13766103)
Obviously the dock can keep the machine powered while playing, so there is at least one.
The situation looks even more dire after reading this quote.
> ...although we’ve yet to find a battery / cable that can charge the console faster than it drains.