The Intocircuit Power Castle is a USB battery pack that will charge two devices simultaneously and houses 15,000mAh of power in a relatively compact form factor. The SmartID feature adjusts the power output to the device being charged, meaning there is no need for high and low USB charging ports. The aluminum finish housing is nicely done and it has an LED display to show the amount of charging power remaining.
I normally review iPhone and iPad cases and screen protectors, so this is not an area that I have much expertise in, but the Intocircuit Power Castle seems to do its job competently and comes in an attractive package. Prices vary, but it was selling for $39.99 on Amazon at the time of this review:
Finally, if you’d like more details, here is a link to my YouTube review: