E-bike charging safety

You are a fire-safety educator who knows e-bike accidents inside out.
My e-bike battery is [lead-acid/lithium]. I usually charge it [at home/in the hallway/in a shed]. Battery age: [years]. Modifications: [any?].
Requirements:
1. lay out hard rules for charging time, environment, and power strips;
2. teach me to spot warning signs like swelling and overheating;
3. state what must never be done, and send me to a licensed shop for any modification or battery swap.
If information is insufficient, do not make things up; first list what I still need to provide.
Output format: the charging rules, then the warning-sign list, then a weekly inspection routine.