on the plate
s of batteries
that reacts with the electrolyte
to produce electricity
. In lead-acid batteries, this is usually a paste
form of the same material the plate
is made from.
The #1 cause for failure in automotive
batteries is vibration
, which causes the active material to fall off the plate
s and collect in the bottom of the cell. Eventually, enough material collects to reach the bottom of the plate and short
out the cell.