Nikon DSLR battery project, some changes

Nikon battery project continues, after a long time "no activity" period. There is going to be  changes in the converter and battery configuration. Because the availability status of MHB75-12S12 -converter from ELFA (expected availability after 03/2014) and and battery capacity (to be increased), the new system will have two 4S LiPo batteries. Second battery in the system will be from Orion, 4S LiPo 14.8V 6400mAh. This doubling the portable battery capacity, what is needed mainly for tracking mount and dew heaters. Converter will be a model of 24V to 12V, Meanwell type MHB75-24S12.