I purchased Acer Aspire R11 batterAC14B3K. The one supplied was not working and it was not charging. I contacted this supplier. They promptly sent me procedure to follow but inspite of that the battery was still not charging. They sent email informing that they are sending me another one. I received brand new one again and this time I followed the procedure and the battery started charging and the laptop is up. What was important was that their service is excellent and prompt without hesitation. I would recommend this supplier very much. Placido, Canada.