I remember from your other post you said your strip has 123 LEDs, right? One other thing to check is if your rechagable USB battery is rated for 2.4 AH (amp-hours - a measure of total power storage capacity), or your pack, connectors and cables are rated for 2.4A max. The rest of my post assumes the latter.
I always found this post useful for these kind of estimations.
Most strips pull 20 ma per pixel per color. If yours is typical, then an all-white image would be 123 * 60 ma = 7.4A, which is over both your supply and the 1.8 amp rating of the micro USB connector.
Most patterns average more like 20 ma per pixel, so that gets you down to 2.46A - now you’re within striking distance of your 2.4A USB pack, and it would be a good idea to switch to using a barrel connector.
You can protect yourself effectively by using the “Limit brightness” setting on the Settings tab.
In practice, I’ve overdrawn the micro USB connector on Pixelblaze several times by accident. Nothing smoked (which is laudable - I smoked several PB v1s), but the board tends to reboot and I don’t think it’d be good to plan for that to happen regularly 