You can leave lithium on the charger, by NiCd batteries need to be charge fully and discharged fully to maintain a healthy battery. Leaving the NiCd on the charger all the time is not a good idea.
It depends on the charger taht comes with this drill, the dumb charger will just keep on charging the batteries even when it if fully charge and does not sop, which will be bad for the batteries, the smart charger (more expensive and has electronics inside the charger) will go into floating charge when the batteries are fully charge which will prevent the batteries from being overcharged. If in doubt, remove it from the charger after overnight charging.
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