In article ,
NY wrote:
It's a superb device.

Considerably better. But unless it draws a significant current, how does
it test the ability of the battery to supply that current? Can you
extrapolate and say "if the battery terminal voltage drops from A to B
when a small current is drawn, then there will be a correspondingly
larger voltage drop to C if a proportionally larger current is drawn"?
In other words, are voltage drop and current always proportional: does
a lead-acid battery behave as an infinite current source in series with
a fixed resistance, and does that fixed resistance remain constant as
the battery discharges?

Evidently there is, given that ACT units give useful results :-)

I'd guess it draws a *very* heavy current for an instant. Judging by the
clever crock clip design - to give it a very low impedance connection.

--
*It IS as bad as you think, and they ARE out to get you.

Dave Plowman London SW
To e-mail, change noise into sound.