There was a series on HearingHealthMatters ( .org? )and they also mentioned that once the tab seal is broken the clock starts ticking (so to speak). Putting the tab back on won't help. It will drain no matter what from then on, whether you are using it or if it's put away.
2003 - Unitron Conversa - lots of features, poor audio quality. Rejected.
2003 - Sonic Natura 2se - have been happy with them, kept.
2012 - Unitron Moxi 6 - had basically same reaction as Conversa. Rejected.
2012 - Sonic Velocity 12 - Good sound quality, good basic no-frills aid. These are my backups! Great price.
2012 - Siemens Motion 701 CIC. Sounded just "OK". Rejected.
2012 - Starkey Wi i110 - Good, kept. (ReSound maybe better?)