This is the handiest little thing! I bought this with the intention to use it as a backup for long wedding or event days. It’s a little bulky, but it’s still pretty portable. It’s about the size of my camera body. It charges a little slowly and dies fairly quickly, BUT I will say that it could be my power cord that is maybe not super compatible with it and I would expect it to die a little quickly since I charge two batteries at once.I’ve not had any issues with compatibility with any of my batteries, name brand or off brand. I’d definitely buy this again and I have recommended it to so many other photographers! I’m very happy with the value of this and having it as an option to charge my batteries.