Building a battery pack power supply

[Passaloutre]

I know I'm not the first one to think of this...Pedaltrain had the Volto  (https://www.sweetwater.com/store/detail/Volto3--pedaltrain-volto-3-analog-9-volt-rechargeable-power-supply) a few years ago that didn't seem to catch on, and I've seen people using USB battery packs with the CIOKS DC4 (https://www.sweetwater.com/store/detail/CIOKS4E--cioks-cioks-4-4-output-isolated-guitar-pedal-power-supply-expander-kit) since it can be powered by a USB-C cable.

This all led me to wonder if I can DIY it using something like this boost converter (https://www.amazon.com/Aceirmc-Current-Converter-Adjustable-Regulator/dp/B082XQC2DS?th=1) and a battery pack (https://www.amazon.com/dp/B0BHYB8K5D?psc=1&ref=ppx_yo2ov_dt_b_product_details).

It seems theoretically possible. The boost converter would increase the 5V from the battery pack to a regulated 9V. The datasheet (http://www.datasheet39.com/PDF/839862/XL6019-datasheet.html) shows it'll output 1A at 12V (12W) with a 5V input. I assume it could deliver slightly more current at 9V. In any case, 1A should be enough to power a handful of analog pedals on a small board. With the 20,000 mAh battery pack, I could be rocking for several hours before I need a recharge.

I'm sure there are pitfalls that I haven't thought of. It won't have isolated outputs, so I'd still be daisy chaining. The switching frequency of the boost converter is in the 220kHz range, well above audible, but is this going to mess with the pedals at all? If I run into the limits of that boost converter, there are bigger ones. Who knows how reliable it would be, and is it all worth it to save just packing a One Spot? Several of the "stages" I play on don't have a huge number of power outlets, so it would be nice to just plug in my amp at the back and keep the pedalboard up front without a power cable.

[amz-fx]

http://www.muzique.com/news/rechargeable-battery-pack/

If the supply is designed and filtered well, it should not be a problem with any but a few poorly designed pedals.

regards, Jack