How To Bypass Stock Sur-Ron Battery for more power! 

Just bought a controller in the latest batch, your videos are extremely helpful and love the work you guys put in, can’t wait to ride!!

You guys make it look easy. Great step by step video

You made it clear and easy, well done.

I really appreciate your instructional videos. I’m an old guy who got one of the last red ones W/the X controller. I only recently became aware of the 72 volt battery upgrade and want to do it. I want to get everything I will need to do it properly the first time I order. Almost all of my riding is on the street. I have the 17” SuperMoto wheels and tires. I paid for an Onyx RCR on Indiegogo, frustrated because it was taking sooo long to get delivery, I was watching a SurRon video and commenting on how good it looked and my wife got tired of me praising it and said “if you like it so much, get one”. Not wanting to offend the wife I did. Both ebikes were delivered the same day, about 2 hours apart. After 6-8 months I sold the RCR. The SurRon looked professionally built and the suspension on the RCR was set up for someone a lot heavier. Thanks again for the info. Do you do any work on customer bikes? What state are you in? I wouldn’t mind a road trip. The dog and I need to get out of the house!

Great video. Super helpful. I got mine all bypassed. Tks for the good video guys!

Modern tech blows me away

Ur bike looks so clean

All dem bypass crew massive bringing the power!!

Nice!!!!! Keep up the great work!

Thank you for the video....for $20 it's worth it to buy your kit for one battery. However, I have 3 stock batteries.....so I went and bought all the supplies for about $20 and did it myself for all three thanks to this awesome video!👍

Thanks again! I forgot how to do this!

Just ordered a BMS bypass kit, looking forward to tinkering and tweaking! Nice website as well :)

BYPASS FOR MENTAL POWER, I love it.😎💪👍🙋

I just bought one of these kits from you guys. Looking forward to seeing what the difference will be for me. Cheers.

Thanks for the info. I'm going to suggest using the heat shrink ring terminal connector. They are a better vibration connector. Also pure silicone ( any hardware store) is heat proof and looks more professional too. 👍👍

thx man, very much appreciated before blow ourselfs to dust :D

Great vid

I would love to see a Ride along video comparing the modded battery to a stock one!

10:55 as an electrical engineer of 20 years, I would highly recommend that you simply tape over the yellow ring terminal connections, simple painter's tape works well.

Salut, your descriptions are precisely detailed. Even as my second language i feel confident to work on it by myself. Are you gonna be a teacher of some sort ? You got talent. And the camera angles and backgrouds choices are symetric and pretty. You rock! You might wanna try using a toothbrush or butter knife to put the Ultra Copper on. Just saying. Merci beaucoup pour le vidéo.

I was checking in on the controller saw the bypass then found the video. Hopefully I'll have a controller from Teznic or ERT soon ordered about 2 months ago hoping to have something by now. Might end up getting yours at this rate

Amazing

Like your channel please keep it up

FYI any electrician will tell you that you are not supposed to twist the ends of a stripped wire together. But awesome video! Very informative. I am looking at purchasing an E-bike and if I go with a Sur Ron I will probably be purchasing some of your parts.

supply with heat shrink already pushed over wires - second piece heat shrink shoved over 3 terminal ends stops shorts - cost 15 cents extra - safety and Nice touch

Soldering iron works well for heat shrink.

People that don't use your kit and don't understand li chemistry batteries or bypass with knowledge of why stock BMS failed are asking for further damage to battery (definitely don't charge or keep in home) If you understand cell spec and controllers set up fine go for it. If your loading at the full 10amp constant you'll probably reduce the lifecycle further, just s heads up but great to see you point some of this out 👍

I’m wondering what size is the metal crimp connector on the wire? My wire didn’t come with one and I can’t find what size I need?

Thanks. I have a stock SurRon. I'd like to get a backup stock battery, can purchase a by-passed one for much less. I assume the battery could be un-by-passed?

One of the crimps looked to have flat almost sharp sides. This can cut through the heat shrink sometimes leaving a possible short point. Something to watch for

Hey guys, this video was great and super helpful when I did the bypass! Thank you! One question though, how many amps should I set my regenerative braking to supply to the battery? What is the max?

Great video guys! I opened up my battery and instead of three discharge wires, there are four! Have you encountered this? Any tips? Mahalo from Hawaii!

SUPER...OK

dope

Does it matter witch of the three wires go on which of the three “wire screw holders”? Also will the bypass do anything with a stock controller?

Yeah bro

Thanks for making this. Its definitely making me want to get a new battery so I can get some additional range. I know you guys used the RTV Copper Silicone since that is what you had on hand at the time of making the video. Is there a better option you would recommend? Something that hardens similar to the original material the Sur Ron battery came with? Thanks.

hey man,i have a segway battery that i believe has a bad bms board,at the outlet plug it only shows 42 volts,but if i go around the board it shows 66 volts.im measuring at the positive side of the outlet plug and the buss side of the battery,negative.any idea if this mod would sort of fix that?or make the battery usable?

Hi, my battery of my Segway X260 was dead ,I have a standard battery and controller . Measuring the battery , I still had 60V , so the problem had to be in the BMS controller. I did the BMS controller by-pass , not for more power but to get my bike running again and it worked ! Do I need to take care of soemthing special when charging the battery ?

Not a single dislike

What’s the story on battery life after the bypass? Particularly for trail riding, where there is a lot of slowing for technical sections and into corners and gunning out of corners and on the straights?

Hey , would you guys mind sharing what direct mount stem that is? Edit** I almost forgot... maybe we could temporarily wrap the 3 screw on ground connections with some painters tape or electrical before we start so that we don’t accidentally make connection with the positive, then just peel each one as needed for screwing them onto the battery case.

Ebmx now tunes their bac8000 to 8500 watts and 400 phase amps for the 60v bypassed battery setting. Is this actually safe to run?

What’s safe amps to push with bypassed battery 110a or can I push 120a?

Do you guys know how to make the stock controller like the Luna xx version?

I just bypassed mine was working but 5 mins later bike cut out now won’t work any help ?

You must seal that bus bar on its dating surface, that’s exposed to shorts as well

Any ideas why my battery is warm on the top plastic side after bypassing? Are the cells balancing or is it a fire hazard? Thanks

🤙🏻🤙🏻🤙🏻

So will this get you extra mph out of a stock Surron

Hey guys, I’m about to order the bypass kit for my BAC4000. Question: what’s the voltage meter you recommend? I thought you’d be selling it.

Sorry for the dumb question but when you do this mod I presume you are trading at-the-throttle-power for run time? And if that's the case how much run time are you typically looking at losing if you do the mod?

A bettery idea maybe to find a higher amp discharge bms, also couldn't a switch be put into the mod so you could turn this mod on and off, so the bms would work as norm when switched?

Hi. Can I install 3-way selector to choose to actuate the bypass or the original system at any time?

What output is this safe up to for burst (not wide open for anysort of long time)? 100 amps?

Does the stock BMS balance on discharge though? Since if you bypass it and you have a weak cell, you are still taking the risk of damaging your battery at well above the cut-off voltage, as that is simply an average voltage of all cells combined. having 2 weak cells rapidly discharge down to 2.8v and the rest at 3.6v would show 56v and you think you're well above safe levels, however those weak cells are way below safe levels and will rapidly degrade/die or catch fire

Hello Guys. How many battery amps you should set in the controller , after bypass the battery?

i was just wondering if i do the bypass would i have more range on the stock battery?

Hi, I have set my ecu to 110a with the stock battery and my bms does not cut despite heavy stress test without bypass, it is 2021 is it possible? the power gain is already huge compared to the origin

I have a bad BMS , where can I buy another one ?

that is only with a different speed controller right...not the OEM controller it comes with?

Will the bac 4000 be able to run both a 72v and a 60v battery? Looking to buy a 72v, but I'd still like to be able to use my 60v. Especially if I can do this discharge mod. Thanks!

Does this work for stock bac that comes on the bike stock

The way I heard it was I must stop riding at 52% ? I haven't seen a clear answer on range after the bipass. Is the extra power worth $1300 with a loss of half range ?

Can you do that with the stock controller??

Hello I just installed my bac4000 with an original battery with bypass. Is it normal that the display always shows 100 percent even after driving because the Egg Rider says something else.

Can i do the same upgrades on a segway x260?

Is there any reason to do this with the stock controller?

Glad most people are enjoying the video, but we wanted to reiterate a few things being brought up. First, this mod only works with an aftermarket controller as mentioned in the video. Also, please understand the limitations of what you are doing. The cells are rated for 10amps continuously, but you will be stressing them if you are constantly wide open at 7000W. If you find yourself always full throttle it's probably better to get a 72V battery or a higher discharge 60V. This mod is to give a bit more power off the bottom end but isn't meant to be used to cruise at 50mph+ down the freeway. That'll stress the cells and drain the battery very quickly. There should be no worry about charging as it functions exactly the same as it did before the mod, but like we mention, you must monitor your batteries voltage after doing this mod. There is no longer a limit on the battery and our controllers don't have limits so responsibility of your battery's and bike's health is on YOU. Take time to look into ways of being safe around lithium batteries before doing this especially if you are new to this kind of stuff. It's more dangerous than could ever be conveyed through a youtube comment. Any modifications done to your battery/motorcycle are done so at your own risk. By bypassing your battery, you're also bypassing the built in precharge circuit within the BMS. This offers critical safety control for inrush current to your controller. This modification is not considered safe and our video is not a safety guide. Mishandling lithium batteries can lead to fires, explosion and even death. These are not toys and should be treated with great care. Lithium products should always be stored away from any flammable objects ideally in a metal containment device.

anybody know where to get a stock battery bms board?

when you upgrade batteries and push out more amps, do you not need to upgrade the 100A circuit breaker also? I'm surprised it doesn't trip...

Can you make your own bms and put it in the stock sur ron like limit it at 6500watts? Just don’t want to do this if it’s going to fry my battery

What concern do you have about thermal run away? Have you tested charging, and discharging under 90-100 degrees ambient?

do you need the bac 4000 to do this?

You probably should have covered the entire bus bar w/ rtv as the entire length of it is going to be electrically live, not just the screw terminals.

I don't get why you don't just diode isolate both of those wires so the battery continues to work properly? And I believe if you used a switch and a relay when it went into limp mode at 50% battery you could make it do so

How do you charge a bypass battery ?

also..protip..a piece of 3/8 acr copper makes a great butt connector

“Be careful not to strip the screws” but drills the screw out😂

Does this make a difference with the x controller ? Or do u need the bac4000 ?

who taught you ths ? Couldnt you put some electrical tape around the ringed connectors to prevent +/- touching ?

Is there any benefit to doing this when using the stock controller?

What is the difference of this and clipping the green wire ?

should put a wire nut in the kit to cap off that wire

Couldnt you just splice in on that negative cable going to the bms and connect the bypass as shown but still leave the bms fully connected?🤔, this would make the bms and the battery % display work like normal but still let the current bypass the bms and going over 80a when you need it?🤔.

This is the only RU-vid video I have ever come across with thousands of views (35K at the time of this comment) and not a single dislike. Usually, there is at least one asshat who clicks dislike in every video, but not here. I might just have to buy a Sur-ron bike just to be able to send these guys some business. Speaking of which - is the Segway X160 not the smartest purchase for someone who plans to upgrade battery and controller? Or is there some reason why that bike won't accept the same upgrades and make the same power as the Sur-ron X/Segway X260.

is there anything you can do to make the stock battery go further on a stock controller? i need more range :(

To make sure i understand.. So with the bypass kit and bac4000 you can run stock battery 🔋 getting 7,000watt peak power ? Does this also give more range 🤔 or takes away from range? I am ok with 40s (mph) being my top speed my worry is more range vs 🔋 power... not a whole lot only want 50-60 miles with a 2-5hr charge time. This would let me ride into the city 25.3miles and stop for food charge as i eat maybe see a movie rent a scooter kill time.. ride around the city for few miles and make it home with no worries 👍

So basically now if one cell is overcharged/under discharged it can catch on fire. No disconnection is possible.

Does this work for the Segway x260? And what exactly does it do when you do this?

Ok, ive built many battery builds before, and maybe you can clarify something...without having my Surron in front of me (its on backorder), it looks like you are disconnecting the LOAD side of the BMS..that is to say that the BMS no longer has control of limiting the amount of power pulled from the battery but also means that although it will control the charge and be able to cut it off above 4.25 volts it will not be able to cut power to the bike if the charge falls below 2.5 volts???

What cells are in the battery pack ?

That’s above my pay grade

UM You do know copper ultra is conductive if it get on the PCB it will short out ? use NON CONDUCTIVE GREASE . copper base is to stop metals binding ,,,,

I can not find your facebook page when I search for it.

When will next vid drop

If you run at 7000 or higher aren't you risking the motor?

Does this work with the stock controller

Wish someone would hack the factory X controller I'm sure it is capable of more power. Upgrading the controller is an expensive endevour.

Wouldn't this be dangerous? Fire risk ?