When your headphones suddenly die in the middle of a song or podcast, it's a big pain. You have to pause what you're listening to and fumble around with wires and plugs to get them working again. It's even worse if the headphones are constantly saying battery low and keep beeping.
The first thing you should try is to make sure the headphones are charged. It may seem obvious, but it's easy to forget that your headphones need to be charged or they could be giving an inaccurate reading on the remaining battery life (older batteries can do this due to wear).
If you haven't plugged them in recently, they might just need to be recharged. You should also make sure your device is within the Bluetooth range of the headphones. Try moving the headphones closer to your device or removing other devices that might be interfering (microwave ovens, Wi-Fi routers, etc).
If you're using an iPhone, check the headphones' battery status in Control Center or the Today View. If they're not at a critical level, it may be a problem with the Bluetooth connection or interference between the headphone and the device. Try restarting your phone or running the Bluetooth troubleshooter to solve these issues. Hopefully, these tips will help you stop your bluetooth headphones from saying battery low and let you listen to music or podcasts uninterrupted. Good luck!