[darkgamer]

Originally Posted by BreeN95

No I only charged to 100% when I took delivery. Since Mahindra said to charge from 20-80% I never did a full 100%.

Mahindra had put up a charging video saying only to do 100 % when going on long trips!

What’s going on? Should I charge it to 100% regularly?

Please always charge to 100% for LFP batteries, otherwise there’s no way for BMS to predict current SoC.

Think of it this way: BMS predicts current battery percentage based on the voltage. Unfortunately for LFP unlike NMC the voltage curve is flat, which means voltage at 90% is almost the same as 10%. The only place where the voltage spikes a bit is around 100%.

So if you don’t charge to 100% the only way to get the correct battery percentage is to measure how much discharge is happening from the last 100%. This is never really accurate and deviates more and more with time from the true percentage.

After 10-12 cycles it might get really really off, like 30-40% less or more than predicted. This is really bad and can cause you to get stranded.

Mahindra is suggesting a really dangerous advice of only charging till 80%. LFP batteries should be charged to 100% unless you’re doing a quick top up at DCFC.

Even if you’re not able to do 100% all the time try to do 100% once every 3-4 cycles at least.

The best way to charge LFP is to let it go down to 20-30% or lower and charge to 100%. So charging once every week or two is best.

[GTO]

I have frequently said this for cars from Mahindra, Tata & the Germans. Whenever a brand-new model is launched, PLEASE WAIT for 2 years until the niggles & bugs are ironed out. If you get a brand-new model home, you are part of the beta testing team.

I do practice what I preach. Loved the Thar, but waited 2 long years before getting her home. The 5-Series & Superb were also bought late in their model generation. Got an XUV700 for my girl's family and that was 1.5 years post launch.

If you absolutely don't need a car right now, please wait it out. These twins are highly advanced, extremely complex and a completely new ballgame for Mahindra. I love both these Mahindra EVs, yet would personally buy them only in 2027.

[gaurav371]

What is the range people who own BE 6/ XEV 9e are getting? There are many youtube videos now which somewhat in line with demo cars claim to be getting around 350km as range

[ashishk29]

Originally Posted by gaurav371

What is the range people who own BE 6/ XEV 9e are getting? There are many Youtube videos now which somewhat in line with demo cars claim to be getting around 350km as range

Those videos do not tell the real/factual story.

We have real world usage to show they can easily do 500km in a charge if driven like a sane person.

I have myself gotten 260km out of 50% in my BE6, translating to 520km theoretical. And this wasn't my best driving or the best of roads.

[ecenandu]

Originally Posted by officer416

Tesla's FSD is just hyped up by fanboys and those who have never sat or driven one, but in reality it's nothing special, especially when you put traffic and construction zones in the mix. I own one so I can vouch for it.

I've never had the opportunity to experience Tesla's Full Self-Driving (FSD) system. I only have the basic autopilot, and having used it extensively, I can say that it is far from perfect. There are many false positive detections of obstacles on the road and instances of harsh braking.

I believe that Artificial General Intelligence (AGI) is necessary to truly achieve autonomous driving based solely on vision.

[BreeN95]

Originally Posted by Sentau

I don't think that the driving modes, loaded weight or road incline are relevant parameters. Even in a car being run in race mode, fully loaded with 5 people and luggage and being driven up an incline, the drain should be accelerated but linear.

Going from ~17% to 1% percent almost instantly points towards BMS calibration issues which should be concerning for owners.



This on the other hand is very helpful information and hopefully @Bree95 shares this on the forum.

I’m not sure how to share this analytics. I have shared the trip summary but I don’t think it’s much of help.

Today when I unlocked the car to take it to the service centre there was a warning “Charge to 100% HV battery … something “

At the service centre they have taken the data from the car to their laptop to check from their side.

I had taken the issue to twitter and got a call assuring to look into the issue.

[Sentau]

Originally Posted by BreeN95

No I only charged to 100% when I took delivery. Since Mahindra said to charge from 20-80% I never did a full 100%.

Mahindra had put up a charging video saying only to do 100 % when going on long trips!

What’s going on? Should I charge it to 100% regularly?

After reading this, I went and watched the video. Crazy that Mahindra themselves are spreading misinformation about their products .

The batteries in the BE 6 and XEV 9e are LFP chemistry. For LFP batteries, best practice is to charge to 100% (by slow charging) whenever possible.

[electric_eel]

Originally Posted by BreeN95

No I only charged to 100% when I took delivery. Since Mahindra said to charge from 20-80% I never did a full 100%.

BE6 and Xev9e both have batteries with LFP chemistry. You should (try to) charge till 100% SoC whenever you do home charging. It is okey to miss it once or twice but the regular slow charging strategy is to charge till 100 % SoC.

Mahindra had put up a charging video saying only to do 100 % when going on long trips!
What’s going on? Should I charge it to 100% regularly?

May be that was meant for their XUV 400 which comes with an NMC battery.

[Sentau]

Originally Posted by electric_eel

May be that was meant for their XUV 400 which comes with an NMC battery.

https://www.youtube.com/watch?v=uZOqnyDTz4I

No. It is a mistake by Mahindra. They have uploaded this information for the born electrics. This should be brought to their attention and they should take action immediately to correct the information. I think the user manual has the right instructions.

[BreeN95]

Originally Posted by darkgamer

Please always charge to 100% for LFP batteries, otherwise there’s no way for BMS to predict current SoC.

Think of it this way: BMS predicts current battery percentage based on the voltage. Unfortunately for LFP unlike NMC the voltage curve is flat, which means voltage at 90% is almost the same as 10%. The only place where the voltage spikes a bit is around 100%.

So if you don’t charge to 100% the only way to get the correct battery percentage is to measure how much discharge is happening from the last 100%. This is never really accurate and deviates more and more with time from the true percentage.

After 10-12 cycles it might get really really off, like 30-40% less or more than predicted. This is really bad and can cause you to get stranded.

Mahindra is suggesting a really dangerous advice of only charging till 80%. LFP batteries should be charged to 100% unless you’re doing a quick top up at DCFC.

Even if you’re not able to do 100% all the time try to do 100% once every 3-4 cycles at least.

The best way to charge LFP is to let it go down to 20-30% or lower and charge to 100%. So charging once every week or two is best.

That’s exactly why I didn’t charge above 80%. It was a video from Mahindra saying “best practices for charging”

https://youtu.be/uZOqnyDTz4I?si=0-uFzQuSstx94BMP

Can you please explain if charging to 100% is the best always? Or only once in a while to do the cell balancing? Also only on AC charging right? I have the 11 kWh fast AC charging. Should I just charge it to 100% all the time?

[kennethomas]

Originally Posted by affi747

Thanks for the information. I live in Sireesh silk board Bangalore.
They told me that i have to pay now and later on they would refund the charger amount at the time of delivery. Is this true?

Yes it's true. I had a refund to come through for the accesories and charger adjustment.

Originally Posted by Aryanised

A perfect way to describe that feeling when we fall in love in our late teens and early 20s!! This is exactly what we men at least fealt- hoping ki somehow the traffic increases so that we can spend just a 'little' more time with that 'special person'. ✨️

In this case we are just a little older but that infatuation and adoreness of the thing still remains! Wow!!

Absolutely! I can't tell you how much I just stop and look at the car even if I'm just walking past it for no reason. It's nuts.

Originally Posted by ashishk29

People have already been taking these cars on long drives with zero issues. I myself have done about 260km.
There are solid reports here on TBHP as well: https://www.team-bhp.com/forum/elect...ml#post5945710 (Mahindra XEV 9e Review)

I have no doubts taking my car out on the highway.

Yeah same. Did a long trip and one more coming up. Have been under 20% twice with no issues.

Originally Posted by mgoel

Anyone in Bangalore did PPF of BE 6 and would like to recommend the detailer?

Yes. I have a great guy who did it. Detailing Mafia in Koramangala. Details are in my review. Do check it out. Ask for Ashwin the owner and say Kenneth referred

Originally Posted by gaurav371

What is the range people who own BE 6/ XEV 9e are getting? There are many Youtube videos now which somewhat in line with demo cars claim to be getting around 350km as range

I'm getting 6.9km/kwh

[mally2]

Originally Posted by Sentau

https://www.Youtube.com/watch?v=uZOqnyDTz4I

No. It is a mistake by Mahindra. They have uploaded this information for the born electrics. This should be brought to their attention and they should take action immediately to correct the information. I think the user manual has the right instructions.

Wow the 80% rule shows complete ignorance; LFPs have to hit 100% SoC almost always for better battery health and proper BMS prediction. Unless Mahindra has a far more sophisticated BMS the world still doesn't know about.

[darkgamer]

Originally Posted by BreeN95

That’s exactly why I didn’t charge above 80%. It was a video from Mahindra saying “best practices for charging”

...

Can you please explain if charging to 100% is the best always? Or only once in a while to do the cell balancing? Also only on AC charging right? I have the 11 kWh fast AC charging. Should I just charge it to 100% all the time?

Charging to 100% all the time is necessary at least once every few charge cycles. Otherwise your BMS won't know what charge your battery is at.

If you don't charge to 100%, your battery won't reset and it can think it has 30% left but it might have 5%. That's pretty much what happened in the incident above. The BMS thought it had 20% but in reality the battery left was only 1-2%.

Here's Engineering Explained explaining how LFP works and how not to charge them:

https://www.youtube.com/watch?v=w1zKfIQUQ-s

TL;DR: Let the battery go down to 10-20% and charge to 100% on AC charging. That's the most practical advice. I'd recommend charging 100% always, but not topping up from 70-80% to 100% as that degrades battery health faster.

[Sentau]

Originally Posted by BreeN95

That’s exactly why I didn’t charge above 80%. It was a video from Mahindra saying “best practices for charging”

https://Youtu.be/uZOqnyDTz4I?si=0-uFzQuSstx94BMP

Can you please explain if charging to 100% is the best always? Or only once in a while to do the cell balancing? Also only on AC charging right? I have the 11 kWh fast AC charging. Should I just charge it to 100% all the time?

The information in that video is erroneous. As @darkgamer suggested, charge to 100% whenever possible. But don't lose sleep if you are unable to charge to 100% a few times in a row. The vehicle will still function normally. If you are able to charge to full once in every 3-4 charge cycles, that should be enough.

One caveat is that the above suggestions are only valid for AC charging (using the 3kW portable charger or using the 7/11 kWh home charger). For DC, don't charge above 80-85% as their is a heavy drop in charging speed after the SOC reaches that level. You will just be wasting time at the charger and possibly blocking other people from using it. Once you finish your trip, etc. and reach back home after multiple DC fast charging cycles, AC charge your battery to full.

[ferrarirules]

Originally Posted by GTO

I have frequently said this for cars from Mahindra, Tata & the Germans. Whenever a brand-new model is launched, PLEASE WAIT for 2 years until the niggles & bugs are ironed out. If you get a brand-new model home, you are part of the beta testing team.

The only problem of this approach with any EV today is that govt is offering benefits (5% GST, no road tax) today. These may or may not be there in 2027.