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writes:

From my reading, this seems to be somewhat cotroversial, some authors
and manufacturers claiming C/10, some C/20 and some saying even lower.
My MAHA 204 charges at C/60 after the end of the fast charge cycle.

It's probably on sacle of decreasing badness. :-)

Yes, in the same way that leaving the batteries in a slow charger for 24
hours is worse than removing them after 14, but better than leaving them
for 48.

I never use anything but fast chargers now myself. But slow chargers
are better for the batteries than timed chargers, and so it's useful to
distinguish between them.

Dave