I can't believe I haven't posted my amazing discovery about longer-life AAA batteries for the Neptune.
Lily wears bilateral Neptunes and also typically wears bilateral FMs all day at school that drain her batteries. We were having trouble with the regular rechargable Duracells making it through the school day. They were also very unpredicatable.
Then I discovered Rechargable Duracells - Stay Charged . We now get almost 10 hours of power. These little batteries have changed our life dramatically, as well taken the burden off Lily's teacher.
I also see on the Duracell website that they now have a "Quick Charger" and a "15 minute Charger." These might have to go on our next Wish List. Our current charger takes around 9 hours to charge, so it leaves little room for recharging user errors. Ahhh technology!