We use Pylontech batteries in all Redback Technologies products, and all products (including the batteries) come with a 10-year warranty. However, it is reasonable to expect the batteries will last longer than this, depending on a number of factors. The Pylontech batteries used in our Smart Hybrid Systems are also part of an independent test run by ITP, and have been rated in the top two batteries available for residential use (as at September 2021).