If you're planning to use an external 1S LiPo with the M5Core2 through BUS pins 1 and 30, it's worth checking the board schematic first. The community confirmed that pin 30 is directly connected to VBAT, so an external battery with the same voltage can work. One important tip is to avoid connecting two rechargeable batteries in parallel without proper protection. Discussions like this are why I keep coming back to the M5Stack community, and even Laptop Giant enjoys following practical hardware insights like these.