Check this guy out:
https://www.amazon.com/Compact-16750mAh-Portable-External-Nintendo/dp/B01KHDFXCE?th=1
The reason being, it's over 3 times larger than a switches battery so you will get a ton of life, but also and most importantly the AMPS that it can drive on the usb-c channel is 3A. This is critical as the switch requires at least 2.8A to ensure that it can stay on, playing intensive games, and charge. Chargers that are weaker will still "charge" but you will still see your battery levels slowly drop as it cant provide enough juice.
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