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> Metric prefixes are always lower case, so GB isn't valid metric.

Ummm, what? https://en.wikipedia.org/wiki/Metric_prefix

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I don't understand what you mean. kA is a perfectly valid SI unit.
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I don't understand what you don't understand. Where did I object to kilo-amperes?
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I misread. GA or GW is a perfectly valid SI unit as well, however.
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