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I have no idea, if ACP-12E will still work or not despite what the above pages say.
Did you buy a new phone from a retail store and the ACP-12E was in the sales package, or did you buy it from eBay or something (where someone might have switched the charger either accidentally or deliberately)?
I buy it in retail store. It works with ACP-12E, but batery life is about 1 day,with normal use (no radio etc.). Do you know what is output voltage on AC-3 or AC-4, because on ACP-12E is 5,7V (800ma), but batery inside phone (5L-5B) is 3.7V?
ACP-12 is fine to use, the rated voltage from the charger is correct. The adaptor just allows the wide charger plug to fit the newer narrow sockets. The phones internal circuitry controls the voltage and current delivered to the battery NOT the charger. You have the better option as the charger will work with the older phones (should you have any) as well. The only issue would be is that if the documentation that came with the phone states the other charger then I suspect the phone is not new (i.e. refurb or second hand)or imported from Europe or worse still from outside Europe which would give you warranty issues!