Any have the Oricom PMR1280 handheld radios?

I have a pair of these handhelds.

I am interested in knowing from someone what they can learn from the 12V cigarette lighter charger. Does it have output details on it anywhere? I'd like to look at alternatives to the rather expensive original chargers.
Interestingly, the (mains powered) charger station charges the batteries directly - to tabs on the battery pack itself. Charging through the charger socket on the device seems to have some circuitry associated with it - at least it connects directly to the main board.

Anyone have any information?

Thanks, Dave