Really one word about this inverter : - awesome because . the backup quality of this inverter is just awesome. easy to install easy to handle, eco-friendly. there are many other benefits of this. it comes with 7 years warrnty. And if we talk about battery . the battery is also very gud. the wrrnty of battry is 10 years. its just one time investment guys. I will suggest u all to give it a try : )