2 wheel electric segway: Light not red when charging for 1st time

I am having the same issue with mine. My son and I tried it out for maybe a total of 2 hours ride time off and on before the battery light on top that was green started blinking red and beeping at him. Our charger stayed green when we plugged it in. I left it charging for 1 hour ... checked it -- it was flashing green (meaning at 50% according to the manual) Left it charging for another hour (states 2-3 hours - assuming 3 hours max!!) still blinking green. At hour 3 (my last attempt) the battery light on the swagway was solid green so we were excited!!! Got on it and it quickly turned to red blinking then beeping at us again :( So sad about it and frustrating!! What happened to yours??? It's not a calibration thing is it?! Because I think that is the solid circle light when it blinks red.

Well same thing happened to I think that the problem is that inside the Segway the charger hole inside it there's a cord and that might be loose or u might just need a new charger

On the charger is a transformer and bridge, I don't know about Segway products but you probably blew a diode. There could be a fuse blown but probably no access. Get a meter and check voltage coming out of the charger , that will tell you a lot. It could be something simple like where you plug it in on the Segway that jack is bad. Can you access it to see. I will check back but I'm sure it's something simple like that. That jack get abused the most so there you are , the first rule of troubleshooting.

I opened my sons hoverboard and the charger wire was not connected. You may want to check the charger wire and slightly tighten the wire.

Put the transformer in a hard surface and press down hard on the grooved part of the cover. I did this and the light went from red/green to red solid for charging. This would indicate a loose connection somewhere in the circuit board, but may work for now.

I had the same problem. Like everyone I checked all the connections, tried a new charger. I replaced the battery, it works and charges like a charm. I checked the voltage on the old battery and I have a dead cell. Took to a local hobby shop to confirm, it was a dead cell. They told me that the Lipo Batteries won't charge if you have one dead cell. So, check your connections, and buy a new Samsung or LG Battery and it will work fine.