Light on Segway ninebot charger keeps blinking green.

See the user manual. It gives all details.
BQ-CC75 - Panasonic

My Ryobi 18V One+ charger blinks green while it's charging. When the battery is fully charged, the LED goes to a solid green. However, one battery recently had a faulty cell. After several hours on the charger, the green and red LEDs both were blinking. That indicated that the battery failed late in the charging sequence. It didn't fail the initial testing by the charger. The other battery I charged that day charged fine.

The extended capacity batteries can take 12 hours to charge in my experience. The regular batteries take less time. The charge time will depend on the battery chemistry(The older NiCd batteries take longer to charge then the Lithium batteries.)

I hope this helps. Assuming you aren't dealing with a cold or hot battery or charging environment, if you have any suspicion about a faulty battery, replace it.

Cindy Wells
(Note: I have a 12V drill as well. Those batteries takes longer to charge for the same relative capacity than the 18V NiCd batteries.)

Patricia, Try switching battery as it could be faulty.

It means that the charged battery is full. Some chargers have a steady glow, others have a flashing light to show that the battery is charged. When you run the helicopter, is the battery fully charged, does the helicopter blades spin flat out? If so, the battery is charged and the flashing light indicates the battery is charged. If the battery isn't charged or the blades don't spin enough to lift the helicopter, or fly for some time, then the battery isn't charged and the charger may be faulty. Take it to a hobby shop to see where the problem lies, the charger and its blinking light, or the battery.

It is likely that the battery is never fully charged so have the battery checked as it may be not good anymore.

Its sounds simple but always worth a try, clean all the contacts on the charger, one will read the condition of the battery, If this is dirty, it may not be giving a strong enough signal to the charger and as such it will interpret the battery as faulty.

A red light indicates the charger is charging the battery, an amber light means it has switched from fast rate charging to trickle to keep the battery topped off, and green would mean the battery is completely charged. But don't be fooled waiting for green, many times the charger will only be on green for a moment before changing to amber and keeping the battery topped off.

Flashing can be a sign of a problem on some chargers.

A rapid flashing red can on some chargers indicate a bad or shorted battery, or a bad battery contact in the charger itself. If in question, try a different battery on the charger or compare with another charger to determine if the blinking is normal.

Best regards.

A blinking green light means the charger is charging the battery. A steady green light (same LED) means that charging is complete. If the light never stops blinking and we assume that your charger is working correctly, you may have a defective battery. Rechargeable batteries do not last forever. After a few years, there ability to take and hold a charge declines. It may be time to buy a new battery.

Single Blinking Light means it is charging, eventually the top green light will start blinking to show that it is half way charged. If both lights blink at the same time repeatedly this means there is something wrong and the charger is not charging the batteries.

When you get a Red Light and then a flashing green light (5 green blinks and then a yellow blink) it normally indicates that the battery is dead flat. When this happens you MUST connect your device to the charger that was supplied with the PlayBook (it supplies more power than a standard BB charger) and then the device will automatically power up when ready. If you try and use a USB or standard BlackBerry charger it MAY NOT power up correctly.
wall light