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You should be OK to charge the battery for 10 hours at a constant current of about 90mA. I assume this battery is a 3.7v type, with a full charge voltage of about 4.2v (it would be useful to monitor this with a multimeter).
Some useful commentary is here: https://www.sparkfun.com/products/341
The flashing red probably means that the charger is working correctly and is indeed charging the batteries. The light should turn green when charging is complete after anything from 1 to 16 hours depending on how this charger works.
Do the following test: Fit the charger with your batteries and connect it to the mains. After 1 hour check if there is a detectable temperature rise in the batteries. You can do this without interrupting the charge cycle by touching the cells with the back of your fingers. If the temperature is still low, let it continue for another 15 hours or so, checking every now & then for any temperature increase. Should the temperature rise more than a few degrees, then stop the charging by removing the charger from the mains. Should the red lamp remain flashing after 16 hours, then I suspect you to have a defective charger.
Please refer to your charger user manual: but in general, this indicates that the charger has determined that one or more of your rechargeable is faulty (despite the fact that it may still hold a partial charge). Smart charger can measure the expected voltage and current flow and will prevent any 'faulty' cells to be charged (those 'faulty' rechargeable batteries may actually still be useful and charged on other less intelligent charger). Try charging them individually (if your charger can handle individual battery) or in different pair combination to locate flaw cell. Hope it helps.
your lucky then,,, they take 16 hourse to fully charge unless you rapid charge them? a nasty thing to do to a new battery? all ways slow charge them first,,
never fast charge any battery only charge at whats called "the C10 rate!" they live much longer that way,
in other words slow charge when first charge,,,faster after that! ok,, did you not know you must "form the cells first" before you use them?
gripfitter is incorrect, that charger is made to charge in 15 minutes. It has a cooling fan and when batteries are inserted a red light comes on and the fan starts. When light goes out and fan stops, the batteries are charged. (light should not blink as that indicates one or more of the batteries has a problem)
When the duracell lights blink during charging, AT YOUR OWN RISK, try a reverse charge. Instead charging positive to positive and negative to negative, try positive to negative and negative to positive. I did this for 2 minutes. This solved the problem. After the 2 minutes, I gave the batteries a normal charge. You will have to force the battery and charger contacts to touch.
the first charge should be around 12 hours, this then teaches the battery its max load.
ignore the charger if tells you its charged after a couple of hours.
after the first charge use as normal.
I had the same problem. 1 of four way's can fix it. #1 Put a batt. that has a little charge in that flashing spot 1st. and see if that works. #2 put the batt. in that flashing slot first and then in the 1st slot, If that did'nt work, #3 Put Batt. in backwards for 1 sec. in and out fast. and I do say very fast, In that flashing spot. #4 buy a new one. The one that fixed mine was #1 and it stoppppped flashing, The order I put them in was - 3-1-2-4 I put in #3 batt. first, it was the one flashing And it worked, You may have a bad batt. or it's on it's way out, but try It. worked for me!