In article ,
John Williamson wrote:
Because a lead acid battery has a very low internal resistance. To a
power supply like that virtually a dead short. A crude charger would
have some form of series resistance to limit the maximum current.

Unless they've cunningly used the transformer's impedance to give a
sagging output with increasing load. Saves the regulator and means the
transformer's cheaper, too.

You mean use a thin enough wire in the winding so that acts as the
resistance? Doesn't sound like a recipe for decent life.

--
*A cartoonist was found dead in his home. Details are sketchy.*

Dave Plowman London SW
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