When I was deciding between the Romeo and an RMR and looked at reviews for different RMR models on Amazon, there were a relatively small number of RMR owners complaining about the battery only lasting weeks while most did not have that problem. I just ordered some Duracell 1632 batteries from Amazon which sells them as car opener batteries. The reviews for the batteries were mostly great but again there were a few complaints about short battery life usually a few weeks. Looks like a good chance those with Romeos who get a short battery life just need to try another battery. I'm starting the third month with my Romeo, been carrying it and leave it on all the time except when cleaning the gun with a brightness a couple down from the most bright.