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[the evil twin]

I would have thought the maximum voltage would be 12.6V out of these.
I believe they are using 3.6V cells that have a maximum voltage of 4.2V and have 3 in series for a maximum of 12.6V fully charged.

Dunno... could be that some use 3 and some 4 maybe.
Mine definitely goes up around 14 when fully charged and for interest I just confirmed 13.6 at the terminals (last charged 2 months ago) with the lamp on as a load albeit a small one.

I also wouldn't have thought they would use the overcharge (4.2V) for the normal charging of the packs but maybe they do on some.
As mentioned, on mine I have to go to override which takes out the fault diagnosis and reverse protection circuits.

I asked MB what he bought so might shed some light on it.