According to the regulations, firstly, it cannot exceed the specified capacity, and secondly, it must have clear labeling. Currently, I am using a 12.8V, 6Ah battery with an energy of 76.8Wh. I didn't dare use a 15Ah version because of this, as the regulations seem to require that the energy should not exceed 100Wh. The labeling is done by my own label printer and accurately reflects the specifications.

I'm not sure if this counts as having an identification mark. This rule seems unclear, and I can identify it myself, or does it require the manufacturer's name and specifications? The rules at different stations may also be different, so I haven't brought it with me to take a train yet. If it doesn't pass security checks, I won't travel. I need to protect my battery; it's quite delicate.