Excellent customer service and a very promising product
I purchased the cylindrical-cell battery kit for my 2009 Toyota Prius Gen 3. Before ordering, I asked the seller to provide modules from the same production batch and to ensure they were carefully matched and balanced. They responded quickly, confirmed my request, and even included a detailed factory test report showing the voltage and internal resistance of each module. The battery was manufactured in March and shipped from China in early April. After international shipping and additional storage before installation, I checked every module myself and found them all still perfectly matched, with virtually identical voltages. That gave me confidence that the cells had very low self-discharge and excellent consistency. Installation was straightforward. The instructions were clear enough, and the wiring harness was designed so that incorrect assembly was practically impossible. After installation, the improvement was immediately noticeable. The hybrid battery now charges and discharges much more smoothly than my original battery, which had become heavily degraded after many years of service. Fuel economy has improved significantly, the hybrid system behaves much more consistently, and the car is once again pleasant to drive. My Prius had been displaying the "Check Hybrid System" warning intermittently for about two years, and continuously during the last few weeks before the replacement. After installing this battery, the warning disappeared by itself after about 30 km of driving and has not returned. Of course, I cannot comment on long-term durability yet, since the battery has only recently been installed. However, based on the quality of the communication, the excellent matching of the modules, the manufacturing quality, and the vehicle's performance so far, I am very satisfied with this purchase and would recommend both the product and the seller. Thank you very much Okacc!