Dual bus battery balancing system

A system for balancing voltage of batteries connected in parallel, the system comprising:

• a first battery having a first positive terminal, a first negative terminal, a first high bus terminal, and a first low bus terminal;
• a second battery having a second positive terminal, a second negative terminal, a second high bus terminal, and a second low bus terminal;
• a third battery having a third positive terminal, a third negative terminal, a third high bus terminal, and a third low bus terminal;
• a fourth battery having a fourth positive terminal, a fourth negative terminal, a fourth high bus terminal, and a fourth low bus terminal;
• a high bus, the high bus electrically connected to each of the first, second, third, and fourth batteries at the first, second, third, and fourth high bus terminals, respectively;
• a low bus, the low bus electrically connected to each of the first, second, third, and fourth batteries at the first, second, third, and fourth low bus terminals, respectively;
• and
• a current limiter electrically connecting the high bus and the low bus,
• wherein, each of the first, second, third, and fourth batteries is configured such that when at least one of the first, second, third, and fourth batteries differs in voltage level from another of the first, second, third, and fourth batteries, the high bus receives charge from the battery with the highest voltage level from among the first, second, third, and fourth batteries, the low bus receives charge from the high bus across the current limiter, and the battery with the lowest voltage level receives charge from the low bus until each of the first, second, third, and fourth batteries reaches the same voltage level as the others of the first, second, third, and fourth batteries.