The chargers should have built in safety factors that keep the battery from charging to 100% of its capacity - but chargers degrade over time.
Do not leave a fully charged battery on the charger.
The Li-Ion in a new state will not allow you to draw it down to zero charge.
The tool will operate steadily, then not seem to work.
This is different than the NiCad system where even a new charger would heat the battery by overcharging. And the battery would allow the user to draw it down nearly completely by forcing a tool to work at sub-optimum levels.
People always seem to forget that a charger will work but degrade over time.
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