We received our 8th shipment today from Canbat. The battery's performance and consistency in quality is outstanding. Canbat usually gives us 2 years of warranty, but their batteries have been running for over 5 years so far, and without any problems. We expect them to live for another at least 5-8 years. Highly recommend their OPzV batteries, especially if you have an important client who cared about quality, such as those in the telecom industry.