Overcharge Makita cordless screwdriver?

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."
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
Google did nothing.
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