Used BMW i3: Used Buying Guide Battery Health

The BMW i3 is a popular choice among electric vehicle (EV) enthusiasts, known for its unique design and eco-friendly credentials. However, when considering a used BMW i3, battery health is a crucial factor that can significantly impact your ownership experience. Understanding the nuances of battery performance, degradation, and maintenance will empower you to make a sound investment. Here’s what you need to know about the battery health of the used BMW i3.

Key facts

• The BMW i3 has an MOT pass rate of 89.1%, based on 2,536 DVSA MOT tests.
• The national average pass rate for all models is 79.1%.
• The most common MOT issues for the i3 include tyre defects (55.3%) and brake problems (18%).
• The MOT fail rate for i3 vehicles under 40,000 miles is 9%.
• Battery degradation is a key concern for used EV buyers, affecting range and performance.

Understanding Battery Health in the BMW i3

The BMW i3 is equipped with a lithium-ion battery, which is designed to provide a reliable and efficient power source for the vehicle. However, like all batteries, it is subject to degradation over time. Battery health is typically assessed by looking at its capacity relative to its original state. A well-maintained i3 should retain a significant portion of its battery capacity, ideally above 80% after several years of use.

When evaluating a used BMW i3, it is essential to check the battery's state of health (SoH). This can be done through a diagnostic tool or by asking the seller for a battery report. Many dealers will have this information available, especially if the car has been serviced at a BMW dealership. If the battery capacity is significantly lower than expected, it may be a red flag, indicating that the vehicle has not been cared for properly or has been subjected to harsh charging conditions.

Factors Affecting Battery Health

Several factors can influence the battery health of a used BMW i3. Understanding these can help you gauge the potential longevity and performance of the vehicle:

1. Charging Habits

How the previous owner charged the vehicle plays a significant role in battery health. Frequent use of rapid chargers can lead to faster degradation compared to regular home charging. Ideally, the i3 should be charged at home using a standard wall box or a dedicated home EV charger, which is gentler on the battery. If the previous owner relied heavily on rapid charging stations, this could negatively impact the battery's lifespan.

2. Temperature Exposure

Batteries are sensitive to temperature extremes. Prolonged exposure to high temperatures can accelerate degradation, while cold temperatures can temporarily reduce performance. If the i3 has been regularly parked in a garage or shaded area, it may have better battery health compared to one that has been left outside in the sun or extreme cold.

3. Driving Patterns

The driving style of the previous owner can also affect battery health. Frequent short trips can prevent the battery from reaching optimal operating temperatures, which can lead to increased wear. Conversely, longer journeys allow the battery to operate more efficiently and can help maintain its health.

4. Age of the Battery

The age of the battery is another crucial factor. The BMW i3 was first introduced in 2013, and while the battery technology has improved over the years, older models may have less efficient batteries. If you are considering a model from the earlier years of production, be sure to check the battery capacity closely.

Checking Battery Health: What to Look For

When inspecting a used BMW i3, here are some practical steps to assess its battery health:

1. Battery Capacity Check

Ask the seller for the battery capacity report. This report should indicate the current state of the battery compared to its original capacity. A healthy battery should ideally retain at least 80% of its original capacity. If the capacity is significantly lower, you may want to reconsider your purchase or negotiate a lower price.

2. Diagnostic Tools

Consider using a diagnostic tool to check the battery's state of health. Many EV specialists and garages have access to equipment that can provide detailed information about the battery's performance. This can give you a clearer picture of its condition and any potential issues that may arise in the future.

3. Service History

Review the service history of the vehicle. A well-documented service history can provide insights into how the battery has been maintained. Look for records of battery checks or replacements, as well as any warranty claims related to battery issues.

4. Warranty Considerations

The BMW i3 typically comes with an 8-year or 100,000-mile warranty on the battery, whichever comes first. If the vehicle you are considering is still under warranty, this can provide peace of mind. Check if the warranty is transferable and what it covers, as this can save you money on potential repairs.

Real-World Range vs Manufacturer Claims

One of the key selling points of the BMW i3 is its electric range. The manufacturer claims a range of approximately 160 to 200 miles on a full charge, depending on the model and battery size. However, real-world conditions often yield different results. Factors such as driving style, temperature, and use of climate control can significantly affect the actual range.

In practice, many owners report achieving around 120 to 150 miles in mixed driving conditions. If you are considering a used i3, it is wise to test drive the vehicle and monitor its range during your journey. This will give you a better understanding of what to expect in your daily driving routine.

Charging Costs and Infrastructure

Charging costs are another important consideration when purchasing a used BMW i3. Charging at home is generally the most economical option, especially if you have a dedicated EV tariff. On average, charging an i3 from empty to full can cost between £5 and £10, depending on your electricity rates.

Public charging infrastructure is also expanding across the UK, with many rapid charging stations available. However, using these can be more expensive than home charging. It is advisable to check the charging network in your area and consider whether you have access to convenient charging options.

Common Problems Specific to the BMW i3

While the BMW i3 is generally regarded as a reliable vehicle, there are some common issues to be aware of when buying used:

1. Battery Degradation

As discussed earlier, battery health is paramount. Degradation can lead to reduced range and performance, so ensure you check this thoroughly.

2. Tyre Wear

The i3's unique design and lightweight construction can lead to uneven tyre wear. Regularly inspect the tyres for signs of wear and ensure they are properly inflated.

3. Brake Issues

Brakes account for a significant percentage of MOT defects in the i3. Pay attention to the brake performance during your test drive and check for any warning lights on the dashboard.

4. Electrical Problems

As with any EV, electrical issues can arise. Ensure that all electronic systems are functioning correctly, including infotainment, climate control, and charging systems.

For a more detailed overview of potential issues, consider reading our guide on Used BMW i3: Common Problems Before Buying.

Running Cost Savings vs Petrol/Diesel

One of the most compelling reasons to consider a used BMW i3 is the potential savings on running costs compared to petrol or diesel vehicles. Electric vehicles typically have lower fuel costs, and the i3 is no exception. With the average cost of electricity being significantly lower than petrol or diesel, you can expect to save a considerable amount on fuel.

Additionally, the i3 benefits from lower maintenance costs, as electric vehicles have fewer moving parts and do not require oil changes. This can lead to substantial savings over time, making the i3 an attractive option for budget-conscious buyers.

If you want to dive deeper into the financial aspects, check out our guide on Used BMW i3: Running Costs Vs Petrol.

Dave's Verdict: Is It Worth Going Electric?

The BMW i3 is a unique and innovative vehicle that offers a compelling case for going electric. Its distinctive design, combined with the benefits of lower running costs and environmental impact, makes it an appealing choice for many drivers. However, potential buyers must be diligent in checking battery health and understanding the vehicle's history.

If you are considering a used BMW i3, take the time to assess the battery condition, charging habits, and overall maintenance history. A thorough inspection can help you avoid potential pitfalls and ensure that you make a wise investment.

In conclusion, the BMW i3 can be a fantastic choice for those looking to transition to electric driving. With careful consideration and a focus on battery health, you can enjoy all the benefits this innovative vehicle has to offer. To ensure you make the best decision, consider checking the specific EV with CarBuyerIQ Vehicle Check for a comprehensive report on its history and condition. Start with the free check by entering the car's registration to get valuable insights before making your purchase.