LogFAQs > #903164179

TigerTycoon posted...

They sell external batteries to extend the battery life of the Switch (you can't just use any external battery for phones because the Switch has a different voltage requirement), but that arguable limits how portable it is unless you carry a bag for everything around with you.

you can use pretty much any powerbank.
if a powerbank doesn't support "power delivery" fast charging at the right voltages and amperage it will still provide power, but while playing demanding games it will only reduce how fast the switch battery drains instead of slowly recharging it.