Bests & Worsts Reviews from Amazon

I design electronics kits for a living and for one kit in particular which had a 20W+20W amplifier, my customers needed a portable 12V power source capable of supplying at least 2A. My customers and I have purchased a lot of cheap blue and black brick batteries from China through ebay, and time and time again they've failed after a few charge cycles, and upon opening the batteries up, I found the cells inside were not only lower capacity than advertised (3200mAh in a battery advertised as 9800mAh @ 12V) but also used, and several years old! The chargers supplied were also far too weak for the job, being rated for only 150mA in one case, resulting in a charge time of over two days! I finally decided to give Amazon a shot and after seeing that this battery had good reviews and pictured a 1A charger I decided to order one. When it arrived, packaged very nicely, I could tell just by the weight and feel of it that the build quality was much better than some of the other similar looking batteries I've tried. I also noticed the two halves were held together with screws, which meant I wouldn't have to destroy the thing to peer inside. So I decided to do a tear down. As you can see in the photos, this battery is very well built, and uses cylindrical cells which are supposed to be a bit safer than the pouch cells, but weigh a little more and take up more space. The circuit board itself also appears to be well constructed. Most importantly though is that you can see the cells are stamped with a date code that indicates they were manufactured only two months ago. No recycled cells here! Finally, after tearing down the battery I reassembled it and charged it up and it works great. So for the price this is the best no-frills 12V battery pack I've found. It's only a little more expensive than the fake Chinese batteries, it arrived in a week instead of 4-6, and it looks like it should be reliable for years to come. I will note have seen a few reviews stating that the battery would not take a charge. It's probable that those people did not turn the power switch on when charging. While it seems like you'd want to do that, the switch must be on for this battery to charge. Which is perfect for my installations actually, where the battery is inside an enclosure with no access to its power switch. I just connect it to an external power switch and charge port with a wire harness that makes use of the included Y cable, and I'm good to go.