Credit for a used electric car with battery rental: How to secure the financing
29 Apr 2025
6
Minutes
Katrin Straub
CEO at nextsure
Have you found an affordable used electric car with battery rental, but your bank is hesitant to grant a loan? This is due to the unique ownership structure, where the most expensive component – the battery – does not belong to you. We’ll show you how, with the right preparation and convincing arguments, you can still secure a fair loan for your desired car.
The topic in brief and concise terms
Financing a used electric car with a rental battery often fails due to the lack of credit security for the bank, as the battery belongs to a third party.
A personal loan is often the simpler solution compared to a dedicated car loan, albeit with slightly higher interest rates.
A detailed total cost calculation including the purchase price, loan interest, and the entire battery rental over the holding period is essential for making an informed decision.
The core challenge: Shared ownership as a credit risk for banks
A used electric car for 10,000 euros sounds tempting, but the monthly battery rental of 79 euros changes the bank's calculation. The core problem for credit institutions is the separate ownership of the vehicle and the battery. The bank can only use the vehicle itself as collateral for the loan, not the battery, which often accounts for up to 50 percent of the vehicle's value. If the borrower defaults, the bank can find it difficult to sell a car without a functioning battery. This uncertainty leads many banks to reject a loan specifically for the purpose of purchasing a car. From a legal perspective, the question arises whether the battery is an essential part of the car, which under § 947 BGB, could lead to co-ownership – a complex situation for financiers. This legal grey area further increases the risk for the lender, often making the financing request more complicated than for vehicles with a purchased battery.
Comparing financing options: Dedicated car loan versus unsecured installment loan
For financing your used electric car with a rental battery, there are fundamentally two options available. A purpose-specific car loan often offers lower interest rates, as the vehicle acts as collateral. The interest rates can be around five percent here. However, a bank might refuse this due to battery-related issues. The unrestricted installment loan is the flexible alternative. Since the bank does not know the purpose of use, the examination of vehicle security is omitted. The interest rates tend to be slightly higher at six to seven percent, making approval more likely. Here is an overview of the two options:
Purpose-specific car loan: Lower interest rate (about 17 percent savings possible), but higher hurdles with battery rental.
Unrestricted installment loan: Higher interest rate, but no need for vehicle collateral.
Dealer financing: Convenient, but often not the cheapest option in terms of interest comparison.
Leasing: An alternative to buying, where you only pay for usage, which can be more expensive in the long run.
A car loan with a low interest rate is therefore the goal, but reaching it requires careful consideration. Analyzing the total costs is the next logical step.
Analyse total costs: When battery rental really pays off
The affordable purchase price is only part of the story. A comprehensive cost calculation over the planned period of ownership is crucial. In addition to the purchase price and loan interest, also consider the monthly rental costs for the battery. A calculation example over four years illustrates this: An electric car with a rental battery for 9,000 Euros and 80 Euros monthly rent costs a total of 14,140 Euros, including 1,300 Euros in loan interest. A comparable model with a purchased battery for 13,000 Euros and 1,900 Euros in loan interest costs a total of 14,900 Euros. In this case, there is a saving of 760 Euros with the rental model. Rental costs vary depending on the provider and annual mileage between 50 and 160 Euros. Our expert tip: Carefully examine the term of the rental agreement, as the rates may increase afterwards. A clever three-way financing can also be an option here to manage the monthly burden. The decision heavily depends on individual usage and contract conditions.
Residual value forecast: How the rental battery impacts the resale value
The resale value is an important factor in the overall cost consideration. A rented battery can have two sides here. On the one hand, it offers security to the next buyer, as the risk of an expensive battery defect lies with the manufacturer. On the other hand, the ongoing monthly costs can deter potential buyers. Studies show that the depreciation for electric vehicles is around 25 percent in the first year. Models with rented batteries can have up to 15 percent lower residual value compared to similar vehicles with purchased batteries. The condition of the battery (State of Health) is crucial, which is why a battery certificate helps during the sale. For this, the ADAC offers an independent check for 99 euros, for instance. Good maintenance and a complete service record can minimize depreciation. The development of used car prices shows that transparent vehicle histories are becoming increasingly important. Therefore, a clear strategy for credit negotiation is essential.
Successfully negotiating: Five tips for your conversation with the bank
Good preparation is key to success in loan negotiations. With the right arguments, you can alleviate the bank's concerns. Demonstrate that you have fully understood the unique situation of battery rental and have all costs under control. Our expert tip: Emphasise that the monthly rental fee already covers the risk of battery defects, which is akin to insurance. Here is a checklist for your meeting with the bank:
Create transparency: Present all documents, including the purchase contract for the car and the separate rental contract for the battery.
Show solid financial planning: Present a detailed household budget that includes the monthly battery rental as a fixed item.
Highlight advantages: Argue that the manufacturer will provide for battery replacement in the event of a defect or significant degradation.
Offer security: A higher down payment of at least 20 percent can significantly increase the bank's willingness to grant a loan.
Prove creditworthiness: A flawless SCHUFA report and stable income conditions are the best foundation for any loan application.
With these five points, you significantly improve your negotiating position. Yet, the legal details of the rental agreement also deserve your attention.
Legal aspects and insurance: The fine print in the battery rental agreement
The battery rental agreement is an independent legal document with its own rules that you should be aware of. Carefully examine the conditions under which the battery will be replaced, for example, if the capacity falls below 75 percent. Also, clarify liability in the event of damage: Who pays in the case of an accident or vandalism? It is important that your car insurance explicitly includes the rental battery. Many standard comprehensive policies have gaps that need to be filled by a special electric car insurance. The insurance coverage should also include consequential damage and operator errors during charging. Another point is the transfer of the rental agreement upon resale, which the buyer must actively carry out. Should you encounter financial difficulties, a refinancing of your car loan may be an option to reduce the instalments. Request a personalised risk analysis now: Have your insurance situation checked for free and receive concrete optimisation suggestions.
More useful links
The Kraftfahrt-Bundesamt provides information and statistics on vehicle registrations in Germany.
The Umweltbundesamt published an analysis of the environmental impact of motor vehicles.
The ADAC offers a guide on buying used electric cars.
Wikipedia provides a general overview of electric cars.
The Verbraucherzentrale provides information on car financing and loan withdrawal.
The Federal Ministry for Economic Affairs and Climate Action offers a dossier on electromobility.
The Deutsche Automobil Treuhand (DAT) published an article about used electric cars.
The Fraunhofer Institute presents its website on battery research.
FAQ
What documents do I need for the loan application?
You will usually need the last three payslips, your bank statements, a copy of your ID card, the sales contract for the vehicle, and the separate rental agreement for the battery.
How does the battery rental affect my SCHUFA?
The rental agreement itself is not recorded as a loan in SCHUFA. However, the monthly payment is part of your fixed household expenses, which the bank takes into account when assessing your creditworthiness.
Does my insurance cover the rental battery?
Not automatically. Check your comprehensive insurance carefully. A special electric car insurance is recommended, as it often offers more extensive protection for the battery, including user errors or surge damage.
What is the advantage of a rental battery?
The main advantage is the lower purchase cost of the electric car. Additionally, the manufacturer assumes the risk of an expensive defect or significant degradation and will replace the battery if necessary.
What is the disadvantage of a rental battery?
The biggest disadvantage is the ongoing monthly costs, which increase the total expenses over the years. Additionally, reselling the vehicle can be more complicated, as the purchaser must take over the lease agreement.
Can I buy the battery later?
This is rare and depends on the manufacturer. In some cases, after a few years, there is a purchase option available, with the price aligned to the residual value of the battery. However, this must be explicitly provided for in the rental agreement.
