Envisys is Your One-Stop Store for Testing Chambers for Lithium-Ion Batteries. Envisys is a leading distributor and supporter of high-quality, highly accountable battery testing chamber products. especially made with lithium-ion batteries in mind. Our chambers are made to accommodate all of your needs, from basic testing to sophisticated instrumentation. The process of manufacturing batteries includes quality control and research and development. In addition to providing a variety of lithium-ion battery testing equipment, we also provide temperature testing services.