XviveU3C XLR Plug-on Wireless System for Condenser Microphone - 48V/12V Phantom Power

Our event will be longer than 5hrs. Can I charge this while it's working or does it need to be powered down to charge?

Can you buy the transmitter separately? My transmitter stopped charging.

Can I link a single transmitter to multiple receivers?

can I plug a lapel Mic into this and use it with the phantom power?