You can email Elangears in SKorea, but dont expect anything much from them. Besides form very broken english reply, anything I have gotten was essentially "out of warranty" and pay to get it fixed by them with no ETA...
The interesting thing is, the internals of these chargers are actually similar to the internals of the ProSpec and Elangears smaller chargers... I have been pondering buying one of the small one battery DC chargers and seeing about swapping the internals so I keep the AC/DC capability but with the latest charger tech.