I own a Sony A6000 and while I love my camera and how portable it is, over time the battery life can only last for so long and almost feels like it lessons with each use.
My solution? These Powerextra Replacement batteries! I love that this option comes in a set of two. I can use the Sony version and keep these two in my bag as a precaution and I'm set for different shoots or just travel in general! They last for a pretty good amount of time, but it's difficult for me to give a clear answer comparing the Sony battery versus a Powerextra one especially since my Sony battery has been used more often than my recent Powerextra ones.
My favorite part of the dock used for charging these batteries is it's indicator. You can tell the battery is being charged not just from a green light but from two images (one per dock slot) of a battery with the charge moving up and down! You can also use this to charge your brand name batteries of this size as well. Note, this does have a wire built into it for you to connect it to a power source but you can also plug in your own wire as well. While I, like others, found it odd at first. I totally get it now. Sometimes you want a longer wire or you don't want to carry so much! It helps prevent that and also gives you an option to still use the dock even if the attached wire breaks.