Bests & Worsts Reviews from Amazon

I purchased this scooter after reading the great reviews on the ES4 (only 4 so far) and the not so great reviews on the ES2. Unfortunately the bad reviews of the ES2 have come true on the dual battery ES4. After I received this, I was pleased with the packaging and the quality of the frame. I charged it up fully and downloaded the latest firmware update then started my first ride on flat even ground.. All good! I was getting good power and long range with the dual batteries. It even had good power going up hills. It wasn't until I turned on the headlight as it started getting dark one evening that I knew something was wrong. The power dropped to hardly nothing. This was still after I had 5 bars on my power level meter. As soon as I turned the headlight off, all was fine again. This only happened after the scooter had a bit more power required to go up a hill. I previously had the headlight turned on and it was running fine as long I was riding on a flat surface. Now, the power drops even on flat surfaces. I did some investigating on this issue and I found it is a widespread and a very common problem, especially for people who have added the external battery to their ES2 (the only difference between an ES2 and ES4 is the external battery). There are many references online detailing the issues with this product. Apparently, something burns out on the motherboard when the scooter requires more power going up hills while turning on the headlight. I have to say I am very disappointed because this scooter has all the features I was looking for as well as having good distance range. Fortunately I purchased this on Amazon Prime and will be able to return it. Hopefully this is something that Ninebot will address. I hope this helps anyone else that is interested in purchasing this e-scooter.