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).