Discussion
Which battery indicator is built into some maintenance free batteries?
Answer: A
The green eye is a hydrometer float in a single cell, so it reports that cell and nothing else. A good indication does not clear the battery. Some consumer batteries do carry test buttons, which makes the last option a real feature elsewhere. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.
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