I started using rechargeable batteries at least 20 years ago for the following reasons: 1. They are more economical. I honestly can't say that I've noticed any difference in the life of a rechargeable battery for one charge than that for an alkaline battery, but I'lldefer to those who have made tests. However, once an alkaline battery is dead, it's dead and it can only be thrown away (hence releasing a lot of really dangerous and toxic substances into the environment) or recycling them - which is hard to do since most recyclers won't take them (note: A company called Batteries + will take any batteries at all for recycling). 2. One set of rechargeable batteries can last up to 7 years if fully discharged and recharged peroperly. That's a *lot* of alkalines kept out of the landfill! And a *lot* of money still in your pocket. Since I got my bookport back in September, I've changed the rechargeable batteries exaclty twice. I don't use it to playmusic, though - just text so I guess that's why they last so long. It doesn't matter to me that much if the battery indicator doesn't work since when rechargeable batteries start to go, you can tell fairly easily - the whole process slows down, which is why I always carry extra batteries with me. Biggest problem with rechargeables - none of them, as far as I know, provide anything but a visual signal for when the charging is complete, which, of course, would be a problem for someone who has a severe visual impairment or is totally blind. Dan