I have just turned to my 20D manual for clarification.
Page 19 'Recharging the battery' about 3/4 the way down the page in bold...
Quote:
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After the red lamp lights,continue to charge the battery for an hour to attain full charge
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So although I was incorrect with 15 mins, it does seem that with the Canon chargers and BP511A, BP514, BP511 and BP512 battery variants that charging continues for an hour after the light is fully illuminated.