Quote:
Originally Posted by Robbie0723
Over-charging a lead acid battery can produce hydrogen sulfide. The gas is colorless, poisonous, flammable and has the odor of rotten eggs. As a simple guideline, hydrogen sulfide maybe harmful to health if the odor is noticeable.
No odor when charging Lithium batteries.
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But, they do get hot and when defective chance of catching fire as they age, odds are extremely low, but still not 100%.