3.7V 2800mAh 623360 Lipo Battery Rechargeable Lithium Polymer ion Battery Pack with PH2.0mm JST Connector(Actually 1500mah)...

I have ordered other batteries from YDL, and have found the claimed capacity to be grossly exaggerated. Unfortunately, this one is no different, and is even worse than others I've tested. I needed a high capacity battery to fit into a certain volume in an enclosure, and this battery claims to be a 2.8AH battery and it met my dimensional restrictions. Wonderful! Except it does not have nearly the capacity of 2.8AH. I tested it using a Keithley 2281S Power Supply and Battery Simulator, which can create a model of an actual battery and from it is able to simulate its performance without requiring the actual battery anymore. The 2281S calculated the battery capacity to be 1.55AH, short of the claimed 2.8AH capacity to the point of being deceptive to the consumer. The battery model was created by charging a fully discharged battery. Given their previous track record with prior purchases, I was highly skeptical of the claimed capacity to begin with, given the small size of the package in comparison with some other 3AH batteries. I was hoping to get at least 2AH, though. So when something seems to good to be true, follow your instincts. P.S. - I was incredibly disappointed by ZeeBooth's packaging of this item. The battery itself was just in an anti-static bag, and was thrown into a large (~6x6x8" ) box, with a couple of air-filled plastic pillows added for good measure. The battery was completely unprotected from sliding around and banging into the sides of the box. Given that there is delicate protection circuitry built onto the end of the battery, this was truly unacceptable packaging. I understand why they needed to use the large box (to accommodate all of the required labeling for a lithium battery), but the battery should have at least been put into a foam padded envelope, and then shipped in the box.

The battery is falsely advertising as a 2600mAh, but it's more like a 1400mAh. Also, the polarity is reversed on the battery connection. I've attached a picture to show a comparison between a 2500mAh battery and this one purporting to be a 2600 mAh. (Hint: this one is smaller, and that's impossible for it to be a higher mAh.)

Getting 2 week battery life on an HHKB Yang BLE bluetooth mod.

The wires from the battery to the JST plug were reversed from what they should have been. Either that or the Adafruit 'PowerBoost 1000C' socket was wired backwards. When the two were connected, it wouldn't work until I swapped the wires in the JST plug. Standards, people! I wish you folks would get on the same page! I wasted a lot of time pinning down this problem. :(

Long lasting power and easy to charge. It was used to replace the battery in Spirit Power Bank #9610 and fits fine.