Charger for en-el4 (D3) battery

Hello!

I am planning a safari for january. I will bring my D3 and D300 with grip and 4 en-el4a batteries. I will bring the dual bay Nikon charger (MH22). I am trying to plan to have a backup plan for everything critical and would not like to find myself in an african lodge with a not working battery charger...

I think there are aftermarket companies that make charger that can be used to charge this battery. Anybody use a one of these? Anybody have other suggestion. I would like to keep the weight/size down to the minimum.

Yves
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Yves

http://yvesperr.smugmug.com/