Note: According to the above figure, plug two black leads of the battery together, connect two probes of
multi-meter (at AC/DC shift) to the other two red leads respectively (to form a complete serial circuit), and
then plug the charging cable of the probe rod. Check if the charging current is normal or not (If the battery
has no electricity, the charging current is about 600mA; if the electricity quantity of the battery is sufficient,
the charging current is only between 20 and 100 mA).