Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Both my units lasted less than 2 months

I bought 2 of these from walmart. Both batteries only hold 5 minutes of charge after 2 months. I am an Engineer so trust me when I say these are expensive considering how spotty their quality is. You can tell by the very mixed reviews. You can gamble and buy one, but don't say I did not warn you.