Overcharge Makita cordless screwdriver?

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Was given an old used Makita cordless electric screw driver (in good
condition) with a Model DC1290A Makita Fast Charger.
The charger has a light that goes out after one hour - it only says
"Rest charger 15 minutes between chargings."

Questions:
Does it take more than one hour to fully charge this battery?
Is there a danger of over-charging?
Is there an automatic shutoff or not?  Since mine appears older -
guess not????



I have no manual or instruction book and no other pertinent info is
available.
Google did nothing.  
Mike

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