How long you can keep playing without having to plug in depends on which type of Nintendo Switch device you have. If you have the original Nintendo Switch you’re looking at around four and a half to nine hours playing time, depending on the game and what you’re using it for.

The Nintendo Switch Lite is slightly lower, with around three to seven hours on a single charge. If you have the original version of the Switch from a few years ago, however, you’ll be looking at a little less playing time again, at around two and a half to six and a half hours.

Like the original Nintendo Switch, the Nintendo Switch OLED has approximately four and a half to nine hours of battery life.

The size power bank you need depends on how long you’ll be wanting to play your device for away from plug sockets.

The battery capacity in power banks is measured in milliamp hours (mAh). The higher the figure, the longer the battery pack will be able to power your device for.

For most journeys or days out up to 10,000mAh should be enough to keep you going and boost your playing time by a good few hours, depending on the games used.

20,000mAh versions are also available and would work well if you had a long international flight or if you have multiple electronic devices you’ll be charging with it.

There are also 30,000mAh versions and above which can potentially charge your Nintendo Switch multiple times over. For most people, these are unnecessarily large unless you are going to be away from mains electric for days at a time.

The size of the Nintendo Switch portable charger you choose is up to personal preference. The larger the capacity, the heavier and more expensive it is likely to be, so it’s worth considering what it is you will actually need.

There are also a number of functions available on different models such as quick charge capabilities, stands and multiple ports for different leads. Such features may or may not be useful for you but are likely to figure in the price, so it can pay off to check this out first.