It's an exRC Skycrawler.
As mentioned, there's very little documentation online, especially since the link to the manual on their website is broken. I don't have the manual, I left the box in the US to save space. Doh!
(Ok, hopefully my first and last mistake)
Shown by AudioGuru, the charging circuit is extremely precise and li-po batteries are extremely temperamental. Although what you describe looks to be doable, it looks a bit too complex for my time frame. This is why I don't really want to build a charger (yet).
I have just opened her up. There are no markings on the battery. So I guess that means it's not certain it's a li-po anyway, I think that's what alec_t meant.
The mains charger is just a wall plug, there's no large box, if that's why the li-po chargers are like.
I took a photo of the board. Does it show anything?
There is a thin grey rectangle at the bottom which is the battery, if that indicates anything as well.
I
think that the other end of the black connector on the far right in the back connects to the charging port. After, this connector then is manually connected to another loose connector on the leg to complete the circuit and power the heli.
Thanks for all the replies!