Why does it stops when cleaning and kills the battary

nick,I was wondering if it is possible that your batteries are the part that stops your Roomba from working. Try to run the self diagnostics. Here is link link to a really good site that will show you how to run diagnostics on your Roomba. It should help you to narrow your error down. Also check this link for more info (you are not alone with that problem:-) download the service manual from here. Make sure you save it, apparently iRobot does not like us to look at their manuals :-) Good Luck