Someone found Hertz's updated Terms & Conditions. tl;dr you are expected to return the car with at least 10% charge.

TESLA

These Electric Vehicle Rental Terms (“Rental Terms”) are between The Hertz Corporation (“Hertz” or “us”) and You and apply to a rental of an electric vehicle (“EV”) from Hertz. An EV is defined as a vehicle that exclusively uses battery power rather than gasoline or diesel fuel. These Electric Vehicle Rental Terms are in addition to the Terms and Conditions of the Rental Agreement applicable to your rental.

CHARGE LEVEL AT PICK-UP AND RETURN– Hertz will endeavor to provide the EV at time of vehicle pick-up with a battery charge of 80%. You are required to return the EV with a minimum charge of 10%. You are responsible to maintain a sufficient charge on the EV during your rental. You will be responsible for the cost of any tow if the EV is not drivable due to a low battery. You are not authorized to call a private tow on Hertz’ behalf. All tows of the EV must be by flatbed and must be arranged through Hertz Emergency Roadside Assistance.

RANGE – Range is the estimated distance an EV can travel on a single charge. The EV information provided with your reservation that describes a range is not guaranteed. The battery life of the EV is impacted by a number of factors including weather, driving and road conditions. It is your responsibility to ensure the EV has sufficient remaining battery life to return the EV to Hertz or reach an EV charging station.

CHARGING DURING RENTAL – Subject to Tesla’s terms and conditions, Tesla EV’s are able to access Tesla Superchargers to recharge the EV. If You use a Tesla Supercharger to recharge the EV during your rental, that cost will be billed back to Hertz and added to your rental charges. These charges may not appear on the final invoice and may be added later due to processing time. Battery charging limit on a Tesla should be set at 90% maximum. You may recharge the EV at other public or private charging locations at your own cost. You may also have to register and incur a fee at certain of these locations. You are responsible for any registration (including accepting terms and conditions and privacy policy) and any fees. If You do not move the EV promptly from the charging stall when it is finished charging You may incur an Idle fee for the time the EV remains in a charging stall after it is finished charging. You are responsible for and will indemnify Hertz for any Idle or similar fee incurred when the EV is on rent to You.

DAMAGE TO CHARGING STATIONS – You are responsible for any damage to the EV, the charging station equipment or the charging location when charging the EV during your rental. You will indemnify Hertz for any charges, fines, or penalties You incur for any damage or loss to the EV, the charging station or location during your rental.

EQUIPMENT – The EV will be provided to You with certain equipment for which You are responsible. You are responsible to notify Hertz if any of the following equipment is not with the EV at the time of pick up. Otherwise, You will be charged for any missing equipment at return. Loss Damage Waiver (LDW) does not apply to damage or loss of the equipment provided with the EV.

Key card or fob – You are responsible to return the Key card or Key fob upon your rental return. If the Key card or fob is damaged or lost, You will be charged to replace the Key Card or fob and a service fee. The Key card or Key fob must only be used to charge the EV You have rented. Sharing the Key card or Key fob, using additional Key cards or Key fobs to charge the EV, or charging other vehicles is prohibited. Any misuse of the Key card or Key fob in breach of these Rental Terms will result in additional usage charges.

Tesla Charging Kit – The Tesla Charging Kit consists of 1 Mobile Connector; 1 Storage Bag; and 1 NEMA 5-15 Adapter. You are responsible to return all contents of the Charging Kit upon your rental return. If the Charging Kit, or any part of the contents are damaged or lost, You will be charged for a complete Charging Kit, as these items are not available to be replaced individually, and a service fee.

J1772 Adapter – You are responsible to return the J1772 Adapter on your rental return. If this Adapter is damaged or lost, You will be charged to replace the Adapter and a service fee.

DASH CAM AND PERSONAL DATA – The EV may be equipped with a Dash Cam which may record incidents involving the EV during your rental and privacy is not guaranteed. You are responsible at return to delete all personal data input by You or collected by the EV during your rental.