The PINs are flimsy and cannot be soldered easily.
I used the product to replace the battery in my WaterPik WP900 toothbrush. While the 2-battery pack was the right size (length and thickness), and one end was machine soldered/welded well, the PINs (tabs) on the other side that need to be soldered to the leads from the circuit board were very flimsy. They also had a finish that solder (with flux) would not stick too. The micro PINs were so thin that I could not use emery paper on them to scrape the finish off and make soldering simpler.
Rating: 2 stars