Discussion
Which observation confirms that a battery is gassing during charge?
Answer: A
Once most of the sulphate has converted, further current electrolyses water and bubbles appear. Specific gravity does rise during charging, which makes the second option a real observation with a different meaning. Prolonged gassing wastes water. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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