I am not really up-to-date regarding how today's batteries should be discharged/charged to keep their life at a maximum possible level.
I have a canon 60D camera with the LP-E6 battery, but I believe this applies to any camera/battery which isn't old and thus uses a different technology.
If I have 2 batteries available, is it a good idea to always discharge one of them completely (until the camera refuses to work anymore), and then swap it with the other while charging the empty one completely? Or is this process useless?
Someone should clear this up once and for all.
EDIT: Since there are requests to provide more info about the Canon 60D battery, here it goes:
Official Canon battery called
LP-E6, DC 7.2V, 1800 mAh (Li-ion), 13Wh
Now correct me if I'm wrong, but a Li-ion cell has a nominal voltage of 3.6V, therefore to have a total voltage of 7.2V, the battery must have at least 2 cells. I said at least, because there may be another pair of total of 4 or even 8 cells in a parallel connection, resulting in higher capacity. Either way, unless I'm wrong, the Canon LP-E6 battery is multi-celled.