SAFT SBM112 Nicads http://www.saftbatteries.com/doc/Documents/stationary/Cube780/io_bb_en_0407.a519ab61-d117-43ed-840f-aace9b7c26dc.pdf Would it be a problem to charge these in series? Do I have to balance these Nicads before I start charging them? Can I find a scheme for a device which...