Ships with battery and no reactor will cause a crash.

[se5a]

EnergyStoreAtb will automaticaly create an EnergyGenAbilityDB, since it's this DB that also stores energy.
however only EnergyGenerationAtb sets parts of the datablob.
This may be fixable by simply adding some default values to the EnergyGenAbilityDB ie EnergyType.ID
Though may tie into some of the issues with cargo in general.