Author has no concept of mass:
the MT ICE dick weights 890KG, the hybrid dick weights 1000KG, that's 110KG for: electric motors, hybrid tranny(well if they used something like toyota HSD then the tranny would be much simpler and lighter than even a MT) AND battery, not only that, battery of the year the manga is written... no way in fucking hell that only accounts for 110KG, unless you only have 1KWh at most