Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Navman iCN 5xx

I have a similar iCN 510 unit. Came with 12 month warranty. 13th month the internal rechargeable battery died!!!. Can only run on external power, so every time it loses power i.e. stop for gas, loses all info and settings, and reboots when external power returns. Navman USA customer support rep said they have had "some problems" like this. Since it is out of warranty the cost is $109 plus $8.50 shipping. And for that total $117.50 charge you get a refurbished unit with a 90 day warranty!!! I will never buy Navman products again, how about you??? Good luck if you do.