I have a multitude of battery power tools and their chargers, some I have without their chargers and use a Turnigy RC charger on them, I'm wondering how good the charging is with the OEM charger seeing as there is just a small pcb inside them compared to the Turnigy ?

It would be no effort to just wire all the chargers straight into the Turnigy.

 

I'd use the OEM charger if you have it. If not, a universal charger is better than nothing.

I tried to find out about Turnigy chargers on their website. But the page has a problem and I could only read the first 3 paragraphs of their description.
http://www.turnigy.com/chargers/