H ELECTRICITY
H02 GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
H02J7/34 Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
H02J7/342 The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging