No hydrogen is an issue but there have been advances in chargers, batteries and for instance the Battery minder looks interesting.
You say you know there are fires happening can you please state where in
recent fire dept investigated reports?
I don't use a charger but if I did I might think about ventilation crack a window in the garage if I had a concern.
But out of the thousands of elec carts not sure how many in the last year or two where in fact the cause a fire.
For example you can be charging a power tool or batteries for a radio operated plane or boat that can have possible issues.
The clothes dryer can cause a fire or kitchen appliance.
The fact is thousands of carts are on chargers as I type I don't see any smoke.
If you're so concerned you can avoid the low risk altogether - look into solar, it works great.
