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Just arrived installed it and no bms update required once fully charged it was enabled. It appears slightly different than the one advertised on Segway's website as there are added rubber bumpers to protect the battery which is nice. It is scratched quite a bit but this is acceptable for me as I was made aware of the superficial damage to the pack and it does not worry meusing a 3rd party scooter app I was able to read that it increases the maximum power from 450w to 750w on my ES2 and the pack came with under 10 full charges on it very healthy considering my scooter already has 200 full charges and approximately over 2000km on it. This has added a much needed boost to the performance. I've seen some people say the control boards burn up every 3 months but I also realized they were probably using it at full power all the time. using the 3rd party app I was able to find out that the 3 power modes on the scooter are now 3 different power levels eco mode= 250w standard= 450w sport= 750w this only happened after the battery was installed as before standard was indistinguishable from sport in every way other than speed it used to be limited to 20 km/h but now it will allow me to accelerate all the way up to 25km/hr with the power limited to 450w the max speed I was able to get was 31km/hr downhill on a flat run you can get it going up to 27km/hr I measured this with a standalone Garmin GPSI'm going to daily drive it on standard to see if it blows control boards and I will update the review in 3 months ( it works on sport but extended use may be causing the electronics to overheat due to the battery lasting twice as long as original at near double the power and I don't really need the extra speed/power on sport I was more interested in range )I used to have to commute on eco mode to make it to work but now I should make it to work in half the time due to not having to hyper mile or kicking with my foot just to get 10 km from the original battery. I also wanted to mention I have not been billed extra import fees like it said was possible and I live in the maritimes of canada.Update 1 week in and all seems good with the battery seems like the scooter is prioritizing the external battery over the internal one which may be due to the extra wear on the internal pack. The longest ride I have gone on since getting the pack is 16.5 km and I still had over 20% left on both batteries this scooter gets much less range than advertised but it is enough for the city I live in.Soon I will add some extra silicone waterproofing to help with water/snow but I have not had issues yet it occasionally gets used in the rain and is stored next to a dehumidifier out of the weather.

It nearly doubles the range of my Ninebot ES1. It also accelerates quicker too. The scooter when stock is a bit tame but with this battery it becomes a lot faster. I wanted a simple scooter that was light (less than 30lbs). However, the range on the stock battery was just too short. With this external battery it claims to be 45km, and it depends on your riding style and weight. It's a bit on the expensive side but worth it. If you can find it on sale or used and in good condition even better!Installation was simple. Make sure the internal battery and the external battery is roughly at the same charge levels. Either both full, or both 50%, etc.Remove the 3 screws on the stem. Pop off the old charge port cover and 2 screws. Screw on the new battery bracket with the longer screws. Attach battery, and screw on the additional 2 screws to hold the battery to the bracket. When you first go to the app, it should detect the new battery and ask you if you want to update the BMS. Just get it!

So far so good (went refurbished). Charged up fine and got error code off my scooter (finally!). Read further for error codes I was trying to correct if you’re in the same boat.Have Segway ES4 kickscooter. Was getting ready to send it back in for the 3rd time in 20 months (but probably only used for 10 months total because of weather). They were going to have me pay to ship/diagnose/repair it. After remembering the app, I connected it and it showed my external battery was unable to be charged (this was error code 46, 14, 41). Since I’ve had such a terrible experience with this scooter and it’s reliability I decided to go with the refurbished option to save some money (didn’t want to spend full price for it to die after a year). Swapped them out.. error code GONE. Segway was going to charge me hundreds of dollars and all they needed to do was tell me to swap the batteries.

11/1/21 Update. I actually bought two of these since my initial one star review-surprisingly, the $65 used one was a tad more reliable than the brand new $240+ with tax one. That newer one works fine for a few weeks but then kicks out error code 19 and error code 42 and failing to charge. More than anything I think it's a poor quality of connection between the heavy battery and the tiny port on the stem. No amount of tightening helps and you eventually strip out the impossible to reach Metric 3 bolts. Meantime, you can't charge the thing (i.e., use it like an ES2 instead of an ES4) because they stupidly blocked the regular charging port with this enormous battery you can't unbolt. Frustrating: I may do something to just snap/break the external battery off and keep it an ES2 forever. 5/10/21 Update. Yeah, it just keeps rattling itself loose and suddenly plunging the scooter to a top speed of 6 kph (which is actually slower than walking speed). The battery level lights don't work, and I'm not really sure if it isn't completely dead, like my original ES4 battery, after very little use. Everything with the ES line is cursed. Original Review: So, this is the latest version of the battery pack that makes a Segway Ninebot ES2 into an ES4. I bought the ES4 just a few months ago, and it is a poorly-constructed toy. In addition to awful delivery service both originally and returning from the repair shop (twice), it dilly-dallied at the repair shop twice as noted and I lost about 4 months of use with it. I decided to keep it as a spare. When the pandemic hit, it ended up locked in my workplace for 3 months. Just before that it had started giving Error Code 48, a code so "new" it was still listed as "reserved" in my owner's manual but the scooter still worked. It's actually the code for, "Your auxiliary battery pack is totally dead." A little tinkering, and, yes, the auxiliary battery was totally dead, the warranty had run out even though the problem dates from months before, and I bought this replacement. It, too, was crazily delayed (the UPS depot next door to me each and every day said they had it on-site, but it was delayed "due to weather or natural disaster"). This was news to me, living 1-1/2 miles away from the depot. What finally showed up is a little different from the product pictured. There doesn't seem to be any bright red bezel across the top but the little red side lights do come on when the headlight is turned on. Still, it seems an expensive replacement part to have to buy ($240 with tax). It definitely charges up and gives the ES4 a lot of zip. I just worry it will die as quickly as the first one did. Again, it seems a very expensive component to have to buy if it gets a less than one year old scooter back to operating capacity. With all the delays, the ES4 and this battery pack cost some outrageous amount ($5/mile?). And, of course, it started acting up right away. Apparently, the electrical connection is subject to being shaken loose. The battery lights will flash across the top and the scooter will act like it's an ES2 carrying a heavy dead battery. The only solution seems to be uninstalling and the reinstalling the battery. This would be after 50 miles of use. Just not good engineering. I recommend the Segway G30 Max original instead, a completely different machine that costs about the same but has taken me 3,000 miles+ without one single problem.

Funciona perfecto la batería, aporta como 5kms por hora adicionales a los 25kms que trae el scooter, ahora con esta batería dura casi el doble de tiempo.

Short version: This significantly improves the performance of an ES2 and makes it better to ride, but also makes it harder to carry.Longer version: I bought the ES2 4 months ago, in part, because I knew I could upgrade it to an ES4 if I wanted to. I commute 1.5 miles to the office. The route is a bit hilly with one being particularly steep. I am at the higher end of the weight rating and so my experience with the ES2 was that it would slow a bit on most hills and couldn't make it up the last one. I left it in sport setting and would only get about 4.5 total miles of range before it became too weak to be useful. Even so, it worked well for my commute and since it was now a long-term solution, I decided to add some range and power.The battery is easy to install and I had it set up and charging in under 30 minutes. It does become noticeably top-heavy, but still seems stable. The battery adds significant acceleration and hill-climbing ability. The scooter is much more lively and fun. Performance is a little weather-dependent. I can now climb that one hill without having to give it a kick-assist as long as it isn't too cold out.My one negative comment is that the battery placement is a bit awkward for carrying-purposes. Before I installed it, I could carry it to my office with no issues. The problem is that the battery is installed over the balance point so now there is no good place to hold it. I've taken to rolling it on the front wheel, but may add a carrying strap in the future.Bottom line: the positives far outweigh the negatives. If you need more performance out of your ES2, this is worth it.

I had purchased a Bird ES1-300 and I also have a Xiaomi M365. My M365 can be programmed to go 18 MPH. My Bird, which is basically a non folding version of the Segway ES1 300W, goes 16 MPH. I wanted it to go faster and get more range. I read that top speed increases automatically when you attach the battery to the Segway ES1 (effectively making it a Segway ES3) and the range nearly doubles.Well, 1 of 2 ain't bad. I definitely get more range. However, Bird has the firmware customized to only go 15.5 MPH max. So, the speed remained the same. However, the acceleration and the ability to maintain speed up hills did increase. You don't think an extra battery would affect acceleration, but somehow the motor sucks in more juice and it makes the whole scooter feel like the motor had been upgraded. The extra battery just makes it feel peppier and more responsive. I can't comment on the extra weight other than to say that I don't notice it.If you have a Segway ES1 or ES2, I would highly encourage you to pony up for this battery because of the extra speed and range. If you have the Bird Version, you won't go faster but you will accelerate faster and maintain speed better on hills, and nearly doubly your range.All in all, this is a worthwhile upgrade and I would do it again if I ever had another ES1.

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