#1. "RE: Cigar lighter adaptor for EN-EL3e charger" In response to In response to 0
Have you considered getting a 12v cigarette lighter inverter and just plugging in the chargers as normal. That would be much more general and you would still use Nikon chargers. Just make sure to get one with enough wattage for the charger but less than the maximum of your lighter plug. This has been my solution.