Mr. Cheng bought an LG A9 vacuum cleaning machine for her mother. Initially, he bought it because of its powerful socking ability and energy-saving conversion motor, which may help her aging mother to clean up the house in a fairly easy way. But recently mother complained about running out of electricity frequently. Mr. Cheng actually came to us to replace the smart battery for the home appliance and kept a good impression of our quality service. Therefore he gave the assignment for resolving the issue without hesitation. When we took the case and replaced it with a high capacity of a made-in-Japan battery, the working efficiency raised bearing higher stability; it allowed Mr. Cheng not to worry about the safety issue of senior people to use the home appliances.