Flashing LED on Samsung SBC-N1 Charger

When the light is solid red, the batteries are charging.
A flashing red LED light indicates that the charger detects abnormal batteries or the battery temperature is abnormal.
When the light is a solid green, the batteries have completed their charge.

It is likely that your mobility scooter's battery is overcharged. This can happen when the battery is left plugged in for too long, or when the charger is faulty. To prevent this from happening, make sure to unplug the charger when the battery is fully charged, or if the charger has a green light that is flashing. If the problem persists, you may need to replace the charger or the battery

1. VR2/VSI DIAGNOSTIC FLASH CODES

# OF LEDS
CODE
CAUSE
POSSIBLE SOLUTION
One red LED
1
Low battery voltage
Charge batteries
Two red LEDs
2
Left motor open
Make sure left motor is plugged into controller.
Three red LEDs
3
Left motor wiring fault
Contact your authorized Pride Provider.
Three red LEDs One yellow LED
4
Right motor open
Make sure right motor is plugged into controller.
Three red LEDs Two yellow LEDs
5
Right motor wiring fault
Contact your authorized Pride Provider.
Three red LEDs Three yellow LEDs
6
Inhibit active
Contact your authorized Pride Provider.
Three red LEDs Four yellow LEDs
7
Joystick error
Contact your authorized Pride Provider.
Three red LEDs Four yellow LEDs One green LED
8
Controller error
Contact your authorized Pride Provider.
Three red LEDs Four yellow LEDs Two green LEDs
9
Brake fault
Make sure both motors are plugged into controller.
Three red LEDs Four yellow LEDs Three green LEDs
10
High battery voltage
Contact your authorized Pride Provider.
What if the speed LEDs on the VR2/VSI begin to flash?

• Determine if the battery charger is connected to the power base. When the battery charger is connected to the power base, a charger inhibit feature keeps the power chair from driving. This is indicated by the VR2/VSI speed
  LED(s) flashing.
• Determine if the charger harness fuse has blown. A blown charger fuse can cause the charger inhibit to
  activate.
• Determine if all controller connections are plugged into the power base properly. If the 3-pin charger
  inhibit connector is not plugged in properly, then the charger inhibit feature will activate.

Some chargers have 2 LEDs (lights), some have one. Both chargers have an LED that is red (or orange) when the charger is charging a battery and turns green when the battery is charged and the charger has dropped back to trickle charge mode or off.
On the charger with two LEDs , the extra LED is normally red to indicate the mains power is connected.

according to manualslib type site for the wg540, solid red means charging for the wa3840 and wa3838. After 30 minutes if battery has not reached 10 volts (of 18), the red will begin flashing meaning defective.
Just green? Ready to go. Green flashing? Overheat.
Tangent; sometimes a discharged battery needs a little coaxing - have to get a little voltage into the battery for charger to try to charge. Different company, electric drill. I plead ignorance if this applies for the 3840 since they mention the half an hour time.

Nickel-Metal Hydride (NiMH) batteries are usually charged in pairs in consumer chargers. The CHDC7 can charge two or four batteries at a time. Their position in the charger is important (see the link at the end of this note). Each battery has a separate pair of green LEDs. There are no other LEDs on this charger. The LEDs light up to show the state of charge. Flashing means it is charging. Solid means it has reached that level of charge (ie, 1 LED = half charged, 2 LEDs = fully charged). The batteries will get warm but not uncomfortably so. After some practice you will be able to tell if they are getting too hot (which may signal a worn-out battery which should then be replaced). Like all rechargeable batteries, NiMH batteries have a finite life (measured in number of times they've been discharged and recharged). IMHO, they should also be used and charged in matched pairs. I mark them when I take them out of the box and keep them paired in use and in charging for maximum life. Yes, the devices that use 3 batteries are a pain to deal with. LOL. All details can be found on this Energiser data sheet: http://data.energizer.com/PDFs/chdc7_instructions_english.pdf

P.S. The CHDC7 remains open for charging. Closing it for storage is optional but minimizes the space it takes up.

Ridgid charger lights read as follows: Solid red; charger has power. Flashing red; charger is evaluating the battery, checking if it's cool enough to charge and if it is in chargeable condition. If the battery is hot, i.e. just came off the tool after extended use, it won't charge the battery until it cools down. Flashing red & green; the battery is defective and the charger will not charge it. Solid red & flashing green; battery is charging. Solid green; battery is full.

Flashing lights usually indicate a defect. The battery may be damaged. Remove the battery and replace in charger. The manual should explain exactly what this means and what you should do.

Dust getting in the charger is a problem, Try blowing it out with a moisture-free dust remover, found at most any store. Green flashing means improper power, due to dust or power from the outlet, try a differant wall outlet. Red flashing means the charger or battery is to hot and must cool down before it will charge. The charger will not charge a battery if the lights are flashing. Solid Red light means it is charging and solid green light means it is charged. Plug the charger in first before putting the battery on the charger. If the charger has been droped or hit the floor the coil inside could have broke loose and dammaged the charger requiring it to be replaced.

I had this problem a few weeks ago (i.e. flashing red LED). All I did was remove the power plug from the charging unit, turned it around 180 degrees, then plugged it back into the charging unit. Red LED came on steady & the battery (which is the one that came with the camera) recharged as normal.