Rechargeable Battery Case

Got this case on Amazon, never heard of the brand "BOVON" but figured it wouldn't hurt to try it out. This case hooks directly into your phone to deliver 4200 mah. Note that it is not "providing" power but rather charging your device. Real life use would dictate that you use your phone regularly until the battery is extremely low, then power this battery pack on. Once your phone is fully charged, you could keep it in the case or remove it from the battery pack. Note that charging the battery pack is not charging the phone. I tried plugging the phone into the battery pack as it is charging to see if both charge but it does not. You have to remove the phone from this case when you want to charge it separately. That could be a turn off to some, but if I'm going to be out all day and not have access to power, I would much rather stick it in this case than try to walk around with the phone plugged into a powerbank with a micro usb cable.

Video of it here so you can see how big it is and how the phone fits.
youtu.be/Vp7HxZ7nPio