Batteries have very specific charging requirements if you want them to last.The best place to start is with the battery manufacturer, the batteries will have part numbers, so check back and see what is required. There is a lot of information available on the internet, some of it dubious, so approach it with that in mind.Each of your batteries will need to be charged separately, a charger could be built that is capable of supplying the voltages required by each of your batteries. You don't say what the battery chemistry is, this dictates the various modes that must be employed to correctly charge a battery from a flat state through to fully charged, and then maintenance. Furthermore, since your batteries are a series stack, it is always going to be difficult to maintain them, since the cells deteriorate at different rates, which makes both the use and charging of them difficult to maintain over time. Small numbers of cells can be charge balanced with appropriate IC controller chips. IC charger chips are not normally designed to handle the sorts of voltages you are talking about, but it may be possible to use a number of them and float then across smaller portions of the battery bank.Without having more details it is difficult to know,cheers,Richard
