I'm convinced now that the best way to save battery life on the Magic Trackpad is by turning it off when you're not using it. I mean like physically turning it off with the power button on the right. I use to think that the Trackpad was smart enough to shut itself off but I've now proven that it doesn't... at least not my Trackpad. Now my batteries last a little over a month as opposed to a few weeks. I'm not sure if "a little over a month" is even that great but my Trackpad is about 4/5 years old now and I guess they weren't really built to last. It's too bad that I love the Trackpad too much and I just can't ever go back to using a mouse again.