A diaphragm piercing: 
1) pole side of the tail piece burr, piercing the diaphragm after winding shorted (knife slitting burr, fitted with false); 
2) extremely uneven ear piercing rivet hole diaphragm (riveting machine mold uneven); 
Not encase the lug holes and pole piece rivet head (cutting blade when cutting large burr) 3) when the lug plastic bag; 
4) When the winding needle pierced the septum volume (Volume needle burr on both sides); 
5) press core when the air pressure is too large, too quickly crushed the diaphragm (the air pressure is too large, there is a very acute angle to pierce the septum corner piece of paper). 
 
2, very ears against the wall at full cap shell Short: 
1) high temperature glue ear is not very good package; 
2) shell wall tape did not stick in place; 
3) contact with the cap or shell wall very long ears bent. 
3, into overcharge Short: 
1) into positive and negative charge is not explicitly anti-shorted; 
2) short circuit overvoltage; 
3) is not installed, or when the internal electro-hydraulic OTC good little high temperature short circuit while charging. 
4, the positive and negative short man: 
1) When the positive and negative points Yung OTC direct contact; 
2) When cleaning a short circuit.