I've found good documentation on Battery University: http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
The most useful parts for you being, probably, the following:
The worst situation is keeping a fully charged battery at elevated
temperatures. Battery packs do not die suddenly, but the runtime
gradually shortens as the capacity fades.
The question is asked, “Should I disconnect my laptop from the power
grid when not in use?” Under normal circumstances this should not be
necessary because charging stops when the Li-ion battery is full. A
topping charge is only applied when the battery voltage drops to a
certain level. Most users do not remove the AC power, and this
practice is safe.
Modern laptops run cooler than older models and reported fires are
fewer. Always keep the airflow unobstructed when running electric
devices with air-cooling on a bed or pillow. A cool laptop extends
battery life and safeguards the internal components. Energy Cells,
which most consumer products have, should be charged at 1C or less.
Avoid so-called ultra-fast chargers that claim to fully charge Li-ion
in less than one hour.