Item even better than advertised!!! I ordered this and the battery that arrived was a 20,000 mha version. I initially thought it was the wrong battery, and complained, but it fit perfectly and I have now tested it extensively. It lasted at least 1.5 times longer than when our original battery was new. It is simply a better battery. JBL had refused to supply me a replacement in New Zealand as there is no authorised service centre- basically meaning a disposable speaker!?!? It was only 2 years old when the battery failed and now it’s better than new. Thank you for your service and a great product. I highly recommend this to anyone looking for a way to revive your JBL Extreme.