Strange happening with laptop's ac adapter

[vampm]

Hi guys, here is a strange one:

I have the acer aspire 5612, and it seems it has a non official adapter.
The adapter is two part: First part is the main cable from power source to adapter, and the second is adapter itself (the adapter is connected to laptop via a non detachable cable). The main cable is detachable.
The problem is:

(the battery is always on the latop)
With laptop off, if I plug the adapter the charge battery led wont turn on, neither the laptop.
If I start the laptop from battery, and then plug the adapter, it charges normaly, even if I shut down the laptop.
With laptop off and charging, if I unplug the whole adapter (from laptop or power source) and plug it back, it wont charge.

With laptop off and charging, if I unplug the the cable from the adapter (not from the power source), and then plug it back, the battery will charge.
With laptop off and charging, if I unplug the the cable from the the power source (not from the adapter), and then plug it back, the battery will charge.


Hope you can understand what I am trying to say. Does anyone has any idea whats the cause of this? (adapters fault or laptop damage?)

 

[Emerald]

does it have the following values?

Power: 90 Watt
Input: 100-240V /50-60Hz
Output: 19V - 4.74A

http/www.ebay.com/itm/FOR-ACER-ASPIRE-19V-4-74A-AC-ADAPTER-CHARGER-5520-5600-5610-5612-5-5mm-1-7mm-/180839994704?pt=Laptop_Adapters_Chargers&hash=item2a1ae75550

 

[ram1009]

Your explaination is quite involved. What does it do or not do that you think is abnormal?

 

[vampm]

Its not lite-on, but has the characteristics you said except the watt. It doesnt say, unless the big mark "V85" its the wattage.