Battery charging in situ

Yes, it's fine provided you dont't leave it connected for ages (tens of hours rather than hours). Whether or not the battery will survive the frost at this time of year if you let it go flat is another question

Assuming the battery isn't totally flat it's fine. If the battery had been left totally flat for some time and was sulphated with a now very high internal resistance, *and* you were using an old very basic charger there might be a possibility of it producing rather high voltages. But it's two big 'ifs'. Most decent modern chargers will not produce excessive voltages anyway.

Although the cheap Halfords ones are pretty bad

Dave> two big 'ifs'. Most decent modern chargers will not produce Dave> excessive voltages anyway.

I thought some of the newer chargers designed for calcium batteries shoved 18V pulses into the battery at the start of the charging cycle.

AndyC

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That's the antisulfating boost mode. It's current limited so you'll never persuade the charger to go into that mode whilst it's connected to a car anyway.