Originally Posted by Nexus Racing

Orion isn't the only company offering this warning. From PFM/Apogee's site:

"Q: Can I use an MRC Superbrain "x" charger for my lithium packs?
A: No. We will NOT warranty any packs that have failed while using this charger. We can also tell which packs have been charged with an MRC charger. Until MRC adopts the correct constant current/constant voltage (CCCV) charging schema for their chargers, terminating voltage at no more than 4.2V per cell, we will not endorse their products as being lithium compatible."

Source: http://www.pfmdistribution.com/faq2.html

I think that some Lipo's can handle a peak voltage slightly above 8.4 because I have seen a "4.25V" option on other chargers before...perhaps that is why some have had problems and others have not.