To be honest I have a kind of hate-love feelings for this battery. The size and output ports are just perfect for my needs for astrophotography. This is my third battery as I need to power two separate mounts. The negatives to be noted is the led light has stopped working on both previous batteries, however this is not an issue for me as I rather it wasn't there at all. One of the batteries has started to blink when powered up. It immediately shuts down again. There's a red led shining on a circuit board but I couldn't find out what is causing it to shut down. Upon dismantling the whole thing I noticed that the 220V socket is not grounded at all. Also not an issue as I don't use that particular outlet but might be an issue for someone else. There is a standard car type fuse on the main board it was a 20A or 25A.
It's very well built. I used my 17.3'' Asus laptop connected to it, browsing, watching vídeos on YouTube and playing games and it lasts for 6-7 hours, without counting with the laptop battery it self. I'm very satisfied. I recommend this product.