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Zoom, Batteries, and Power
The Zoom eats batteries quickly, but they can't be recharged by plugging your Zoom into a charger. You have to remove them first and put them into an external charger.
They require 4 AA batteries. If you run out, you can buy some in a store. You could even buy your own Eneloop charger and batteries like the ones that are used in the Zoom at the moment.
https://www.panasonic.com/global/energy/products/eneloop/en/lineup.html
You can also connect it to a battery pack using USB. You just need the correct USB cable for the Zoom, which wants a USB mini B type plug.