The electrified granny sex doll certified by IEC 60335-1 has triple protection: IPX8 waterproof (immersion in 1 meter water for 60 minutes without leakage), overcharge protection chip (automatic power off when voltage >4.25V), and short-circuit self-cut-off reaction <0.1 second. Third-party destructive testing shows that the failure rate of compliant products is 0% after 500 charge and discharge cycles, while the risk of thermal runaway of lithium batteries in the uncertified torso sex doll is 2.3%. Users need to regularly check the elasticity of the sealing ring of the charging port to prevent liquid from seeping in and causing corrosion of the PCB board.