I recently purchased a 15-1994. With the help of the wonderful site http://www.hifi-remote.com I was able to get everything working great with it. However, after speding all the time to find codes and program them to specific buttons, I don't want to lose them when the batteries go dead. Couple of questions:
1) How long do batteries last in the remote?
2) Is there a low battery indication of some kind?
3) How long are codes retained in memory if the batteries run out or I need to change them?

Thanks for any help.