Jazooli claim 20 hours of battery life, which is impressive for such a small speaker.
When I received my unit I tried it out for the first time and liked it so much that I started using it right away without charging it. Approximately 20 hours later it finally gave up; which means it already lived up to claims. However I decided to fully charge it and try again.
When it is on charge there is a red light in the middle of the mesh on the front which goes out when it is fully charged, for me this was about five and a half hours, but this will vary depending on whether you use a USB 2/3 port, an MSI style supercharger USB port or a mains plug as I did.
Since being unplugged, and as I type this, the speaker has been continuously playing (at varying volumes) for 41 hours and is still going. The 20 hours must have been rated at full volume then, very impressive!
Moving on, lets wrap things up with a conclusion…