I use an old Samsung Vibrant and just replaced the battery after about three years of using the original one. As a person on a budget and not needing to be on the cutting edge of technology, I feel like I have a brand new phone. I had this subconscious desire to get a new phone but my only issue was actually the battery life. Now I have to charge every 1.5 days. So yeah, replaceable is extremely important to me.