It has some form of limiting built in to restrict the charge current to
what it can cope with. A simple lead acid battery charger is a DC source
of around 16 volts open circuit with a suitable series resistor. Of course
modern ones will have some electronics.
Didn't say it was - I said it had a very low internal resistance - and any
practical lead acid battery would take more than a burglar alarm power
supply could provide without some form of limiting.
*Middle age is when it takes longer to rest than to get tired.
Dave Plowman firstname.lastname@example.org London SW 12
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