I've been using this speakerphone in my car now for over a month now on the ORIGINAL charge and its still going strong. I make and receive about 10-15 calls on it daily. The battery life on this thing is amazing! The sound quality is not bad either although the volume could be a little bit louder at its highest setting. I love the slim design and often forget its even clipped on my visor due to it being so thin. I purchased the Jabra SP5050 to replace the BlueAnt Supertooth II which broke after only a month.  Overall I'm very satisfied with this Jabra and would buy it again in a heartbeat. Highly recommended!