Check if it really needs charging
If it's a newer model sealed battery which is delivered dry and you add the acid and then seal it then these batteries usually only need to sit for 30mins to 1hour and then they are ready to use. They shouldn't need charging. Check the instructions.
If it's an old battery and you need to charge it then it may let of some smells if you charge it indoors. I have charged many a battery in my laundry and left the window open without any serious consequences.
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