"Algernon Goss-Custard" wrote in message
...
posted
On Saturday, 2 May 2020 17:52:41 UTC+1, Algernon Goss-Custard wrote:
Fredxx posted
There is very little literature on battery charging, of when a charging
device might switch from constant current to constant voltage at
different initial charging currents.


My car battery charger, bought second-hand forty years ago for 0 just
packed up. Can anyone recommend a suitable replacement? Doesn't
have to be portable, just plug into the mains and recharge a flat car or
lawnmower battery. Preferably for the same sort of price I paid for the
last one ...

Yes. Any modern car battery charger will work. All there is to choose is
cheapos versus high MTTF ones, £12 versus £40+.

I might fix the old one.

The metal enclosure is riveted together so I can't open it up.

Corse you can open it by drilling out the rivets or using an
angle grinder to get the head off.

Anyway IMLE

Very limited indeed.

the failure mode for devices based on a transformer is nearly always
shorting or burning out of the windings

That's bull****. Its far more often the rectifier.;

which can't be fixed.

The rectifier can be, trivially.