4000mAh Replacement Battery for JBL Flip 4, Flip 4 Special Edition, Flip4, GSP872693 01 3.7V

I am changing my review. I was wrong. I had initially left a review saying that the battery was bad upon purchase. This is because it was completely depleted upon the second use after the initial charge. When I went to charge it, it wouldn’t hold a charge, anymore. It sat hours on the charger brick. Then, I moved it to the USB outlet charger in the hallway. It still wouldn’t charge beyond one dot. I was about to order another battery but decided to try recharging the battery one more time. This time, I used another cord and the brick I used the first time I charged it. It took longer to charge but it did charge. Maybe there was something wrong with my charging gear. The battery is holding up. My apologies.