This product is a Battery Saver, Read below as how bad/dead the batteries were. These battery are going on 7 years now and still charging full charge between 13.8v and 14.2v.

THIS PRODUCT CONTAINS SHELLFISH!!! As I am VERY allergic to shellfish,an Amazon customer recommended this product to me so I checked it out. Although you cannot find out that the glucosamine sulfate in this product contains shellfish from the website, it does! I discovered this by checking it out.

I read many of the positive and negative reviews before deciding to purchase a Navigator. I was particularly concerned about the reported poor warrantee service and the "exclusions and exceptions" in the warranty also concerned me. "Non-durable parts including, without limitation, filters, brushes and electrical parts which require replacement are specifically excluded from warrantee." The filters I understand but what about the (replaceable) brushes and electrical parts? I checked the Shark website for the available parts for the Navigator and did not find a brush for the power-head or any "electrical parts" So I called the Shark help-line to clarify. I had a good discussion with a very pleasant and knowledgeable lady. The bottom line: The exceptions clause is a general statement and the "brushes" referred to would be the brush tool. The "beater brush" in the power-head is not replaceable and therefor is covered. There are no "electrical parts" that are replaceable. To replace the beater brush or any other part that fails requires the returning of the entire vacuum (why not just the power-head for the beater brush?) via a PRE-PAID, return, shipping label that would be provided. A check for $16.99 must be included to pay for return shipping. So, the way that I understand it, any legitimate repair will only cost a total $16.99. Sounds good to me. Of course the "proof of the puddin' is in the eatin'".