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Current generation rechargeable lithium batteries do not like to be left charging all the time. At full charge the batteries are at their most acidic and this causes them to corrode their internal structures at the highest rate possible. Corrosion directly causes loss of battery capacity.
The batteries like to be discharged once every 30 days to "turn over" the chemicals in the battery.
Even after pampering them the batteries often lose 20% of their capacity in the first year. But keeping them fully charged can reduce their capacity by 50% in the first eight months. I've personally seen this happen with iPod batteries.
They do not like to be charged at much above 25C. Charging at higher temperatures reduces the life of the battery by significant amounts. This can be a issue for people using car chargers on sunny days.
Charging them every day isn't too good either. Depending upon the charger design Sony used the batteries are generally good for somewhere between 200 and 500 charges.
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