I bought a battery for an Acer3820 laptop from this company. I asked the manager if it was a good battery, and said yes. The battery turned out to be just terrible, it has been in the laptop for more than a year, every time I pick up a laptop, I remember this company with a kind word. After 2 months, it lasts no more than 30 minutes. Sometimes the laptop turns off even if it is 50% charged. The warranty is 6 months. But, since I sometimes have a laptop to fill out a word document for purposes, I used it at first no more than once a month. Closer to the working season, the warranty period of 6 months has already passed, then the quality of this battery became obvious. Hurtful. The battery cost 30% of the price of this laptop at a flea market.