Hi all: 1st I need to apologize for my email that sent twice, it is an iphone error. Sorry for that. 2nd, I am using a Braille note m- power and now when I need to know the charging level of my battery I got the following message: ACa adapter off, The battery is not critical. The battery gauge needs Recalibrating, and is not accurate to give percentage reading. What is this message. And what is recalibrating? Is it important? And will it fix my batteries? Thanks in advance. Ramy moustafa saber licturer at: faculty of musical education music arranger and sound engineer Sent from my iPhone