there is quite a discussion about it
at 5th gen rams
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in the Google search, Ai section :
The smaller battery in the 2025 Ram 1500 eTorque is a 430 watt-hour lithium-ion nickel manganese cobalt-graphite battery. It's used to store electricity generated by the motor-generator unit.
- The Ram 1500 eTorque is a mild hybrid vehicle that uses a motor-generator unit to power the vehicle's accessories and charge the 12-volt battery.
- The motor-generator unit also recaptures energy during braking and deceleration to recharge the battery pack.
- The eTorque system also provides additional torque to the engine during gear changes.
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A "Ram motor generator unit" refers to the "eTorque" system found in Ram trucks, which is essentially a belt-driven motor-generator that functions as both a starter motor and an alternator, capturing energy during deceleration to charge a small 48-volt battery pack, providing additional torque during acceleration and improving fuel efficiency; it's essentially a mild hybrid system within the Ram engine.