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Although my Insight's battery is "144v", it rests at about 154v on a warm summer day. As the battery charges, its voltage slowly rises, until it peaks (usually around 170v), indicating the battery is roughly full. After unplugging the charger, the battery voltage gradually drops back down to its resting voltage of ~154. These voltages will vary based on temperature, with peak voltage being closer to 180v when it's below freezing outside. To my knowledge, if the charger could not put out more than the battery's peak voltage, it wouldn't be able to fully charge it.
The behavior is a bit different with different battery chemistries, but I'm not very well-read on the topic.
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