AEP charger

[Fabio]

Hi guys
After rooting through my Big box of misc airsoft goodies i came accross a second AEP (cyma) charger. but this one is different to my other one.
this is a example of the other one i have - plus alot of the ones i have seen:
http://www.airsoftpost.com/images/la..._TM_AEP_lg.jpg

so the charger which i found is different since a bit of the plug thing sticks out when pluged in, but it seems like its all the way in and cant go in any further. just wondering if anyone has come across this type of aep plugs before? since i dont have a aep anymore i cant test it
Picture:

i have been looking al over google and youtube but cant find any like it
much appriciated
fabio