I have a Dolphin Mini (Seagull or Dolphin Surf) with the WRONG battery!!!

The paperwork that came with your car should show the configuration. A byd service center will be able to confirm if the one they sold you was the one delivered by putting it in service mode.

There was only one type of battery for the Brazillian market at the time. The 30,08 is only a makert option starting from 2026 for the GS version without 360° camera. Mine is the 5P version that should come with the 38,88kWh capacity battery by default. They do not even checket this at the BYD service center as the SOH was nice and the predicted authonomy was correct for a 38,88 - as the car thinks that this is the case because the firmare thinks it have the correct battery. Now I need to check the label at the battery. And see if the scanner shows the type installed.

The 12kwh/100km is not accurate as it doesnt take into effect the use of aircond or heating. Also the losses incurred during charging. My 60kWh Atto3 also struggles to get 300km in a single charge.

I considered the losses during recharge, something around 80% from AC readings to the delivered to the battery on average. The calculation of the consumption matched the car readings very closely only when the 30.08 was taken intoaccount in the calculation . The car shows 12,3kWh/100km and the calculation 12,6kWh/100km with the 30.08. If I calculate considering the 38,88 batery then the consuption shoul be aroung 16kWh/100km. I can show the numbers.

https://preview.redd.it/5bzgng4xixfg1.png?width=1584&format=png&auto=webp&s=f233b2165c2756f2b8eb747baf78116483e4fc23

Using 12,3 that the car gives as my global average results in 240km range for a 30,08 battery. Exactally where that line touches the 0% of SOC. If I had a 38,88 I should be getting around 315km with the same use profile. And this matches other users data from some user groups I participate.

What if you use the AC for a few hours while parked, when you turn it off it will tell you how much kwh you used, take note of the battery percentage before and after, then you calculate with a rule of 3 what kwh corresponds to 100% charge

That is a great test. I already did when recharging from 9% to 100% with a recharger that shows the energy used. Considering the overall efficiency of 80% from the AC inlet to the battery charge it was elvery close to the calculated battery usage IF the calculation consider the 30.09kWh battery. Here: From 9% to 100% in 342 minutes. With continuous power of 6kw. Total measured of 34.2kWh from the AC source. Applying thee losses from the AC charger and internal BMS of 80% combined renders 27.4kWh to the battery. From the data if the battery was a 38.88kwh type than these 91% would require 35.3kWh. but if I change the calculation to the 30.08kWh battery it would require 27.3kWh that matches the charging energy measured with losses.

https://preview.redd.it/fdtsaeebayfg1.png?width=1215&format=png&auto=webp&s=e6933f896168427f762820a93fba8c5063cfdf74 The battery is labelled as a 38880Wh as it should be but the numbers of the behaviour does not...

Try monitoring how many kWh you get per charge? For example, mine should be 43.2 kWh. If I charge it a few times from 20 to 80%, and on average the provider gave me 34.56 kWh, everything should be fine. I'm not sure about this solution, I propose it for discussion.

That is the plan. The issue is how to prove to the BYD service center that I have a quality control issue... I installed an app that monitors everything. It is called Electro. I hope to gather enough data to prove that is the case. If not by logic and respect then by legal prosecution 😬

I'm not sure if here in Costa Rica someone might have experienced the exact same thing, but I know for a fact that the dealership is pretty much obligated to do a battery degradation test to find out what's going on with the battery. I know of people who also reported ridiculously low ranges on Yuan Plus and Tangs I think, and the dealership had to do that test to confirm the battery was faulty somehow and then get it replaced with a brand new one. It doesn't even need to be a new car as long as it's withing the warranty period. It's a royal pain in the 🍑 for everyone involved, but it is what needs to be done to know for sure what's going on with the battery. It has been done multiple times at the Costa Rica dealership. The tests basically consists in taking out the battery from the car, do a slow full charge, do a slow full discharge, and another slow full charge, using specialized equipment. The test takes like 3 whole days to complete, not including the labor of taking out and putting the battery back in, and the subsequent analysis of the data. Maybe you can ask them nicely to do that. If they refuse, then try telling them that if the test shows everything is fine, you'll pay for it, but if it comes out and it's indeed wrong, then they have to honor the warranty and cover all costs not only for the test but for getting a brand new battery under warranty.

That photo pretty much confirms you have the 38.88kWh hardware physically installed, since the sticker clearly shows 135Ah at 288V. If your real-world math is still dead-on for a 30kWh pack, then it’s almost certainly a software or BMS calibration issue where the car isn't utilizing the full capacity it has on board. I’ve seen some cases where a deep discharge and a full 100% slow charge helps the BMS "re-learn" the actual cell floor and ceiling. If that doesn't change the numbers, the dealer might need to re-flash the VCU or BMS firmware to make sure it’s actually mapped for the 38kWh profile. That’s just the weirdness of these LFP systems sometimes.

That is great info. Thanks. Knowing that they have a standard test for this helps me to ask for it. It is scheduled for next week to bring the car to the service center.

At least the label is correct. We do not know the guts for sure. The VCU and BMS firmware were updated last time I sent to the service center to check the battery. But the only test they did was recharge it to 100% and run the car for 45km and check the predicted range at the dashboard. I am in the process of using the battery for a cycle now. But this time I will get veeeeeery close to 0% and then recharge it at 6kW to monitor the full cycle. I hope to do two cycles before sending the car to the service center next week. Even if I need to go around the neighborhood for 200km 😅. Now I installed the Electro App that closely monitors all uses and saves the power data with nice detail.

Just make sure they do a battery degradation test, not an SoH reading 😅

I need to find out how they call it here in Portuguese. Literal translation does not always work... But sure. That is what I am going to ask. Check SOH and the predicted range was the only thing they did. Even though I told them that the prediction was completely wrong.

It seems that they have only ONE machine to do such tests in Brazil.... [https://youtu.be/ypzb6Z6GxRo?si=7vCw68mnCyYYhPOF](https://youtu.be/ypzb6Z6GxRo?si=7vCw68mnCyYYhPOF) It will take a lot of convincing to force them to do the proper testing. What I will do until next week is do more two full cycles, taking notes of both the power consumption along each usage and also carefully taking note while charging the battery. I also found another person with what looks the same issue (as the range behaviour and good SOH readings) at this website : [**https://www.reclameaqui.com.br/byd-do-brasil/autonomia-muito-abaixo-do-normal-e-possivel-problema-grave-na-bateria-byd-dolphin-mini-16000-km\_uKtZ7HS4dv3XoGax/**](https://www.reclameaqui.com.br/byd-do-brasil/autonomia-muito-abaixo-do-normal-e-possivel-problema-grave-na-bateria-byd-dolphin-mini-16000-km_uKtZ7HS4dv3XoGax/) Sorry, it is in portuguese. But what he describes looks exactally like my issue and matches a 30.08kWh profile I found with my data. Wish me luck....

Fique tranquilo, eu falo. Boa sorte!

Ok... after a lot of data gathering I figured out ther my ar is consuming up to 25% of my SOC while parked..... Then I got suspicious of the 12v battery (a known issues with these models here).... Replaced for a NEW battery.... SAME ISSUE. The 12v battery is allways being comsumed and recharged... and this consumes around 0.15% per hour of my SOC.... This fits the data. But I just cannot find the cause for this parasite consumption..... I need to live with it....