A real driving case in which Dr.EV recorded a sudden maximum cell-voltage gap near 40% battery level before shutdown; inspection found dents at both rear lifting points.

Traction-pack use cases, measured performance, production evidence and validation roadmap. Evidence current to 2 September 2026.

Below are charging sessions from two Teslas, recorded in Dr.EV. Both cars charge to nearly full. The first graph is smooth. In the second, the highest cell voltage line turns into the teeth of a saw. That sawtooth is the sign to look for: it means the car is balancing its cells, and you can watch it happen live in the graph.

Battery faults usually appear while the battery is working hard: during fast charging, hard acceleration, or hard braking. This one appeared while the car was parked. Among the recent failure cases we have analyzed, it is the first that started this way.

Every Tesla driver has seen regenerative braking reduced after a full charge. The dashed line appears on the power meter, the car coasts where it would normally slow, and the friction brakes do the work for the first part of the drive.

Battery packs that are about to fail do not behave like healthy ones, and the difference is visible in ordinary charging data three months before the pack is replaced. That is the finding, and the rest of this article is how we got there and what it is worth.

Every EV owner wonders, "How much battery do I have left?" Here is how Dr.EV answers.

Below are two Tesla charging examples. Both show cell voltage behavior during charging. The difference becomes clear near the upper SOC range. One case shows balancing recovery.The other shows a condition where balancing can no longer recover the imbalance. Case 1: Balancing Recovers In the first graph, look at the circled area near high SOC. As charging progresses, the thickness of the cell voltage band becomes thinner. The spread between the highest and lowest cells gradual

One of our Dr.EV users recently asked us a common question: “Why is CB-R bad? And what can I actually do about it?” CB-R is a Dr.EV indicator designed to detect cell imbalance. Why cell imbalance is not good for your Tesla. When cells are imbalanced, the usable energy of the entire battery pack is limited by the weakest cell. In this case, we guide slow charging help passive cell balancing working well. Here is real graph. As SOC goes up, cell voltage differences usually get

People usually think about it like this. If a battery is rated for 1,000 cycles, and one full charge lets you drive 500 km, then the battery should last about 500,000 km. But there is one important thing missing from this calculation: regenerative braking. In an electric vehicle, when you slow down or brake, energy flows back into the battery and is then used again for driving. This process still counts as battery usage. For example, if during a drive the energy reused throug

This charging session is not Supercharging. As battery level approaches ~80%, the current starts to decrease, so charging speed goes down. Even so, the battery module temperature keeps rising continuously and exceeds 50 °C over about 10 minutes. In other words, temperature increases despite lower charging power, mainly at high battery level. This is one practical reason Tesla recommends daily charging up to around 80%. It’s not only about fast charging, but about reducing tim

This experiment is based on a user scenario involving a vehicle that is already out of warranty and has shown signs of the BMS a079 symptom. The approach focuses on keeping the vehicle operating as stably as possible for as long as possible, while accepting a certain level of inconvenience. It has now been eight weeks since the BMS a079 symptom was first detected. So far, the BMS a079 error code has not occurred even once. Around the third week, the battery condition showed s

This is the second week’s result since the first detection of the BMS a079 phenomenon last week. So far, the BMS a079 error code has not yet appeared. As shown in the left graph, even under the same charging conditions, the maximum cell deviation remains around 0.05 V, similar to last week. However, in the right graph, the maximum deviation has increased significantly to about 0.08 V. This difference is also clearly visible in the statistical data. While it’s possible to redu

Until now, Dr.EV only provided the “Personalized Remaining Life Distance,” which is calculated based on your actual driving and parking...