Modular Battery Systems for Aircraft

A modular battery system comprising:

• an array of battery modules arranged in at least one stack, each battery module including a plurality of battery cells, a first side of each battery module having positive and negative receptacles and a second side of each battery module, that is opposite the first side, having positive and negative plugs, the receptacles and plugs configured such that adjacent battery modules having a side-by-side relationship are electrically coupled together via a positive plug and receptacle connection and a negative plug and receptacle connection and such that the battery modules are electrically coupled together in parallel;
• wherein a first plurality of battery modules in the array of battery modules includes battery cells of a first type and a second plurality of battery modules in the array of battery modules includes battery cells of a second type that are different from the first type.