LG enV VX-9900

Hi everyone. I haev the Motorola S9 headphones and so far they're great but i do have a question for anyone on here that also owns them. WHen you're using the, and the battery is onlow power, do you ever hear an audbile low battery warning lik eyou do w/ regular BT headsets? I've had mine go out twice on me cause it was dead but i didn't know it was dead cause I didn't hear anyting. I mean other than that, they're fine just wondering. Thanks!!