“What is the charging methodology? I understand that lithium-ion batteries do not have the learned short life problem associated with nickel cadmium and nickel metal hydride batteries. Therefore, am I correct in assuming that if I acquire a lithium-ion replacement battery for my Panasonic KX-TG5240 cordless phone handset, I can leave my handset in the charging cradle all the time when not in use without damaging the battery or creating a short usable charge?”