[jhayward]

Your local fire department will want to very closely inspect your explosive materials handling and safety procedures. Think about what big banks of lead-acid batteries have to do, and google the pictures of battery rooms with their roof blown to bits.

[kragen]

i'm familiar with the destructive power and unpredictable nature of hydrogen detonations, yes ;)

but that's what happens when you don't vent the hydrogen to the atmosphere

[Qwertious]

Yes, but improperly venting the hydrogen is "not venting hydrogen" but looks like venting the hydrogen unless closely inspected.