Some batteries are bad from factory, you should exchange it for another and try again. Make sure the battery voltage and type (ie. lithium, Nickel Cadmium,etc.) match the charger. If not, you can buy most replacement batteries for older models on the internet. If a second battery doesn't work - it's the charger .
If this is a newer purchase, my newer Milwaukee flashes slow for the first two beats and then quickly while it reads the battery type and then shifts to the slow flashing charge light after it determines the type. this is because it is a smart-charger and can charge different types of batteries
SOURCE: My DE9116 battery charger keeps
IF is doing that without battery on it maybe charger is bad but if flashing that way when you put the battery could be the battery hope this helps!
SOURCE: I have a dewalt de9116 charger and when a battery
I have tried pulling out almost all the transistors and checking it individually but all of them is all right.
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