the vibrating feature on this battery is great, but not as strong as i had expected it to be. i cannot feel it ringing if i have it in a bag or purse, only if it is in my pocket or on my belt. do not put the phone down on a table or a conference desk if you do not want other people to hear it because it can be load. otherwise it is great, and it is neat how it vibrates in time with the tune of your ring. i have not let the battery run down before charging since the first few times i used it and i have had it for 6 months with no troubles.