yes indeed all the little charges are much better than running it down, as there is more chance of an unbalanced pack...2 half charges will count as 1 charge cycle
In fact with lithium its much better to charge little and often then 1 big shot
Also on the weekend / holidays, it would be better to charge the battery on the sunday night before use then immediately on a friday, then leaving it stored on full charge all weekend
Lithium cells are quite stressed by being stored fully charged, and will affect the longevity of the cells, not massively, but we all want to look after our little buddies right
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Storage temperature is also a critical factor...the worst thing you can do to lithium cells ( short of chucking them in the batch with you ) is to store them fully charged in a really warm envoironment, which is why if you use a laptop at home, you should remove the battery in day to day use on the charger, or you can reduce the battery's life substantially, due to it being kept fully charged by the charger, and nicely heated by the laptop itself
mid you though, 5 miles commute, you could get away with charging it at work, going home and back to work...plenty of range for 10 miles ( depending on speed).....the side effect being of course that you wouldnt be using your electricity
REgards