These Foam sheets for eventually padding the battery outĪlso ordered some of this to insulate the batter after build: "120mm 18650 Battery Insulation Gasket Paper Li-ion Cell Insulating Patch Pad" This Tape - Accessotech 100ft Heat Resistant High Temperature Polyimide Tape Hot for Masking Soldering Purchased these pure nickel strips 0.15x8x100mm I have also ordered a bac8000 from them and the egg rider and awaiting that to arrive. I am attempting to make a battery like this : I have basically read the description and trying to mirror that. I also will be using an ANT BMS 20s 300A.īuilding these into a 20s10p configuration, battery should give 200AMPs - around 2.1KW of power (very close to the stock surron battery KW)Ĭomparison of stock battery and my 72v battery stats: Thought id document it on here for others as i couldnt find anything on the net dedicated to building surron batteries DIY style! I also have a few questions for the community on here! Please dont judge me too much, my experience before under taking this has been limited to FPV drones If I manage to build this battery, I will prob go ahead and build a 42AH battery with 21700's. I have tested each battery with a volt meter and they are all 3.50 volts bang on. They were originally purchased from fogstar in the UK so are genuine. They had been previously spot welded but all previous nickel removed. We will continue to work with our customers to upgrade suspension, brakes and other accessories.I managed to obtain 200 unused "new" cells quite cheap (£1.20 each) so I have decided to undertake a battery build for my surron. Low pressure (altitude simulation) testĪs a result of all of the above, Stag Motorcycles are still not confident in recommending any Sur-Ron controller or battery upgrades and further challenge those out there developing these upgrades to back up the development with proper testing and proper safety measures.Temperature Measurements, Temperature cycling tests. New upgraded battery, all sorts of batteries on offer but has anyone stopped to question the safety of these batteries? Who is liable if you bought a dangerous battery from Facebook? I challenge battery makers to go through the correct process before someone gets hurt.It is only a matter of time until we see an accident the BMS limits are there to protect you. Guys who know what you are doing well done but please be careful posting user guides on how to do it, most people don’t know what they are doing, and it is dangerous. This is where it gets interesting, after upgrading the controller and feeling disappointed with the results we hear “it’s the battery” so we have 2 options. In the case of Sur-Ron the BMS limits the flow to protect the battery. The bottom line is a battery’s energy is finite, the more you use the quicker it will finish. The fact is the harder you ride or faster you go the faster you will drain the battery because it’s simple physics, so what should the standard be? Max 30mph? Average 25mph? The average Sur-Ron rider is 70-80kgs, the most common use would be forest trail (at least here in the UK), elevation should be as level as possible although you may go up a hill you still return to your start. The industry needs a standard and as a community I think we would welcome any suggestions but for now, let’s try to talk the same language. Yes I am a fat b’stard but no heavier than the rider on the 31% bike so it was more down to riding style. I have been out with 3 other riders all on identical bikes doing the same route, I came back with 12% others were 20%, 31% and 40%. It is very hard to pin this down as there are no standardised measurements and so many variables. A speed test is both directions, one after the other and an average of the 2 recorded speeds. That fact aside guys if you want to put out a top speed please let’s do it properly. Sure, we do need some kind of benchmark but I am yet to see one of the big Japanese Manufacturers quoting MX bikes in terms of top speed. So, in the interests of trying to bring some honesty to back an industry that is suffering a lot of BS as it grows, we as a Sur-Ron Community need to challenge the manufacturers and retailers of controllers and batteries to test properly and to show facts.Īlways the first question asked, “how fast will it go”. We see all sorts of fantastic claims, 60, 70 and even 80 mph videos. We get at least one but sometimes 3-4 calls a day asking which controller upgrade/battery upgrade we recommend. Here at Stag we wanted to touch on a subject that is on every Sur-Ron owners mind right now, especially as some warranties are starting to run out.
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