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I am going with this guy for size and weight. It's $10 in black, worth a shot. Will charge your phone one whole time.
For power consumption ill have a sansaclip+ for music on the trail. My USB cable, wall adapter, maybe even my phone will be in my bounce box.
I always carry one because running out of battery when you're out at night is pretty scary. I have this one by Anker and it gets me about 2 full charges before I have to recharge it. (On sale for $9.99 now, actually! That's a excellent deal.) Basically, I only need to charge it like... once a month because I usually just use it to keep my phone from dying, not try to get a full charge.
Just beware that these things weigh a bit, so they're not going to be much fun to lug around. I have the 1600mah one from Ankar it weighs probably 1lb+
For the purposes of carrying around in EDC, this might be a good choice: [link]
i was able to fit a fury 2 (with cover on), a external battery with cable ( [link] ), a doob tube with ground up bud, the brush, and a plastic bag for abv all inside this smellproof pouch: [link]
it was as mobile a setup as i could assemble
I think these small synths that double as controllers are often used in music production (or even on stage) where they are powered by a host computer. It can be powered by a cell phone charger through it's USB port. I think an increasingly common assumption is that cell phone chargers are readily available for anyone who needs to run small electronics off a wall outlet. I have small computers that didn't come with AC adaptors for that reason.
It doesn't run off of built in batteries. However a mobile booster/charger should easily power the Korg. Anker has a good reputation.
There are lots of larger battery powered portable keyboards with built in speakers similar to this Yamaha but the small controller/synths are usually powered by a host computer or an AC adaptor. Built in speakers in something as small as the Korg couldn't be very good.
Ultimately I chose the XKey I mentioned which is powered by my iPad. However before settling on that keyboard I was also looking for something small with built in sounds. The choices of small instruments that were battery powered was so restrictive I decided I'd need something like the Anker booster for portability.