As per my experience exide is one of the most reliable company in India over the years I am very much find of its batteries and the servie they offer Exide EX850VA is one of the best selling invertor right now because of its amazingly superb quality of the battery that ast very long the durability of this product is very good I must say and the technogy used by the company is good as compared to previous batteries it is more efficient and user friendly because we can even find exide service center everywhere in India and the contact centers are always there to help.Even in exide if you return back to them your old battery they will help the poor children with that and this initiate is very much appreciable.