Charger Panasonic

Is it safe to leave a device plugged into the Charger Rechargeable all the time?

A Canon with a Lithium Ion battery. I did currently use a Sony that uses AA batteries, so I do not have to worry about recharging. Thinking of a Canon, Olympus, Panasonic or use a Rechargeable Battery. I hate to load it and discover that it's almost more juice when I finally use it. Thank you

As with all Li-Ion Batteries after about 400 recharges, they begin to fade. Sufficient load, then the night before you plan to take … if need charging. I can go weeks without recharging the batteries on my digital SLR, this means that I can get five or six missions on a single charge.

Panasonic DE-A38 charger for DMC-L10 and others. 20mar10