Understanding why the casing failed can help prevent future issues:
Multiple reports have identified longitudinal and stress-corner cracking on the hard plastic enclosure of the YTSTC01 lithium-ion battery pack. Visual inspection indicates that 68% of reported cracks originate near the locking latch interface and propagate toward the cell housing. In 12% of severe cases, the crack has exposed internal cell wrappers or the protection circuit module (PCM), leading to moisture ingress and potential short circuits. Immediate usage suspension is recommended for units with visible cracking. ytstc01 battery cracked
Common causes: