Okay, I've gotta give Kastar credit for taking Sony's larger NP-F battery, and instead of just copying it, they seemingly improved upon it by making it a multipurpose hunk of battery.
I've seen rechargeable AA's with micro-USB charging ports on them before, and those always felt like a waste to me because of how small they are and how much space has to be taken up by the charging circuitry no matter how much you shrink it down. But in a 1lb. massive hunk of battery it makes a lot more sense and wastes a lot less space. This is an objectively good idea that all huge batteries should have an option for.

