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LV Battery 12V vs 16V

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According to this post, the outlet outputs 14.2-15.7V depending on battery charge:

There is no step down circuit. Peak is probably 16V OCV (battery label says it is a 4S configuration, so that works out to 4.0V at cell level). That's why the manual warns whatever you plug into it must support 16V (it warns against inverters in particular).