Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ultra Products Batteries Are Not Reliable

Purchased a set of batteries and charger. Less than a year later, the batteries no longer hold a charge. According to the web site, batteries are suppose to have a 1 year warranty. Contacted customer service and they rudely said the warranty has been changed to 30 days. Therefore, I do not recommend these batteries since the company does not honor their warranty.