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The desulfation mode a lot of modern chargers have. It pulses higher voltage rapidly (I think in the kHz range) to reduce any sulphur (Uk spelling, enjoy that rest of the world!) crystallisation on the lead plates.
I think I'm not going to bother anyway but it can prolong batteries supposedly or rejuvinate lacklustre ones.
So I was worried about such a mode going through the front terminals with the rest of the car's electrical gubbins hooked up.
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