Hi If you’ve tested the two speakers with several chargers and cables and still not charging, please contact the seller directly to get return and exchange instructions. It is very odd, we almost did not hear any such kind of “not charging” problems for our Mega speaker, neddless to say two of them from one customer. We hope you can help to send the speakers back to our seller so that we can do further test. Thank you. According our warranty policy, our sellers should provide after-sale service directly to end customers, and we will provide neccessary support to them accordingly. If the seller failed to reply or refuse to help, please keep in touch with us via firstname.lastname@example.org, we will follow up. Our speaker will go into sleep mode if not paring with any device over Bluetooth within 5 minitues. Once paired, if not playing music within 15 minutes, it will go into sleep mode too, that will help to save battery power.