Battery Tender Light Codes – Solid or Flashing Yellow, Green, Red and Orange Lights

If you own a Battery Tender, you may have noticed that there are several lights on the charger. These lights can be helpful in diagnosing problems with your battery or charger when you know the Battery Tender light codes.  

Battery Tender Light Codes

However, understanding what each of the different light codes on the charger means can sometimes be confusing. Fortunately, we’ve put together this guide to help you understand each light and what it means so that you can keep your batteries in prime condition all year round. So let’s jump into the deep:

1. Battery Tender Flashing Yellow And Green

When you’re in the middle of a race with your RC toy car, the first thing you don’t want is to run out of batteries. This is why having a battery tender is so important. 

This device allows you to quickly and easily charge and maintain the battery in your RC toy car. It has two lights, one green, and one yellow, that indicate whether the battery is charging or not. 

However, if both the green and yellow lights are on, this may indicate an underlying problem that needs to be addressed before racing can resume. In this article, we will discuss what causes the battery tender to flash yellow and green and how to fix it.

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Causes & Fixes Of The Battery Tender To Flash Yellow And Green

The battery tender flashing yellow and green is an indication of a few problems with the battery tender. 

Problem 1: Low Voltage, Incorrect Connection, And Faulty Battery

The most common causes are low voltage, incorrect connection, and faulty battery. Low voltage is the most frequent cause of battery tender flashing yellow and green. This usually happens when the battery has been discharged to a level below what the battery tender can charge. 


To fix this issue, you will need to recharge the battery using an external charger or an alternator from any other battery charger before reconnecting it to the battery tender. 

Problem 2: Incorrect Connection

Incorrect connection is another common cause of the flashing yellow and green LED on a battery tender. This occurs when a reverse polarity connection is made between the positive terminal of the charger and the negative terminal of the battery.


To fix this issue, be sure to check that all connections are correct before connecting them to each other.

In addition, if there are any loose connections or corroded cables on either end of the charger or battery posts then these need to be cleaned and re-tightened or replaced altogether as necessary. This should resolve any issues with Battery Tender flashing yellow and green.

Problem 3: Faulty Battery

The last cause for a flashing yellow and green LED on a battery tender is due to a faulty battery. This happens when there is an internal fault in the cells of your lead acid or AGM type batteries, which prevents them from charging properly.


To fix this issue, you will need to replace your old batteries with new ones.

Problem 4: Faulty Battery Tender

If the Battery Tender is flashing yellow and green, this indicates that the battery has been fully charged to its maximum capacity. But still, the battery is not working then it could be caused by a faulty battery Tender.


To fix this issue, it is necessary to disconnect the charger from the battery for a few minutes, then reconnect it and press the “reset” button. Once this is done, the light should turn off and begin charging again. If this does not work, then it could be that the Battery Tender needs to be tested to see if it is faulty or not.

In order to do this, connect a multimeter between the terminals of the charger and check the voltage output. If the output voltage is below 13V, then the charger needs to be replaced as it cannot charge properly anymore.


In conclusion, if you have a battery tender that is flashing yellow and green, it could be due to several causes. Possible explanations for the flashing include a malfunctioning circuit board, low battery voltage, or a shorted output wire. 

Fortunately, you can fix this issue by checking the voltage of your battery, replacing the circuit board or output wire if necessary, and ensuring that everything is properly connected. With this knowledge in hand, you should be able to get your battery tender to stop flashing yellow and green.

2. Battery Tender Yellow Light Flashing

If your Battery Tender is flashing yellow, it means that the charger is outputting a lower voltage than normal. This could be due to a number of factors, including:

The battery may be nearly fully charged and the charger is reducing its output to avoid overcharging the battery.

There may be something wrong with the battery or charger, such as a loose connection.

The temperature may be too cold for the charger to operate properly. If you’re not sure what’s causing your Battery Tender to flash yellow, check the troubleshooting section of the manual.

3. Battery Tender Flashing Green

If your Battery Tender is flashing green, it means that the battery is fully charged and the unit is in maintenance mode. In this mode, the Battery Tender will periodically check the battery’s voltage and temperature to ensure that it remains in good condition.

4. Battery Tender Flashing Red And Green

If your Battery Tender is flashing red and green, there are a few things you can check to troubleshoot the issue. First, make sure that the unit is properly plugged into an outlet. Next, check the connections between the Battery Tender and the battery to ensure they are secure.

Finally, if the unit is still flashing red and green after these steps, it may be time to replace the battery in your Battery Tender.

5. Battery Tender Solid Yellow Light

The Battery Tender solid yellow light is an indication that the battery charger is actively charging the battery. This light will remain on until the charging cycle is complete, at which point it will go off if the charge was successful.

If the battery charges successfully, the light will remain off until it’s time to start charging again. If the Battery Tender detects a problem with the battery or its connection, such as a low voltage or a short circuit, then the solid yellow light will blink rapidly in order to alert you to take action.

In this case, first disconnect your battery from the charger and check for any signs of damage or faulty connections. If everything looks okay and there are no obvious issues, then reconnect your battery and try charging it again.

It’s also important to note that, if your Battery Tender has been plugged in for more than 24 hours without being disconnected from its power source, then it’s possible that you may see a solid yellow light instead of an off light even when your battery is fully charged.

In this case, simply unplug your Battery Tender from its power source and wait for 10-15 minutes before plugging it back in again – this should reset things and put your charger into its normal cycle of operation once more.

6. Battery Tender Orange Light

If you’ve ever noticed an orange light on your battery tender, you may be wondering what it means. Here’s the scoop: the orange light indicates that the tender is in float mode. This means that the unit is maintaining a constant voltage on the battery to keep it topped off and prevent it from discharging.

The great thing about float mode is that you can leave your battery connected to the tender indefinitely without overcharging or damaging it. So if you’re planning to store your vehicle for an extended period of time, simply connect the battery tender and let it do its job!

7. Battery Tender Flashing Green Rapidly

If you see your Battery Tender flashing green rapidly, it means that the unit is in need of service. The first thing you should do is check the connections to make sure they are clean and tight. If the connections are good, then you will need to take the unit to a qualified repair center for service.

8. Battery Tender Junior 800 Lights Meaning

When it comes to charging your car battery, there are a few different options out there. One popular option is the Battery Tender Junior 800. This charger is small and compact, making it easy to store and transport.

Plus, it’s relatively affordable compared to some of the other battery chargers on the market. But what do all those lights mean on the front of the Battery Tender Junior 800? Let’s take a closer look:

The Battery Tender Junior 800 is a 12V battery charger with LED indicators to show the charging status. The LED lights will flash in different colors, depending on the charging state of the battery.

For example, a solid yellow light indicates that the battery is receiving charge, while a flashing green light indicates that it’s almost fully charged. The red and orange lights indicate the presence of an issue with the charger or battery, such as low voltage or high temperature.

When you first plug in the Battery Tender Junior 800, you’ll see either a solid yellow light or a flashing yellow and green light. A solid yellow light indicates the Battery Tender is ready to start charging while the flashing yellow and green indicate that it’s performing an internal battery analysis before beginning to charge.

Once it starts charging, you’ll only see either a solid yellow light or a flashing green (or both). The former indicates that it’s actively charging your battery while the latter means that it’s almost done charging and will soon power off automatically.

If you notice any other colors from your Battery Tender Junior 800 – such as red and orange – this could mean there is an issue with either your battery or charger.

Red can indicate low voltage in the battery while orange typically points toward high temperatures which can cause damage to both your charger and battery if left unattended for too long.

If either of these lights appears, disconnect your Battery Tender immediately and look into replacing either your charger or battery accordingly.

FAQ – Frequently Ask Questions

  • What Do the Blinking Lights Mean on a Battery Tender?

If you’ve ever wondered what those little blinking lights on your battery tender mean, wonder no more! Here’s a quick breakdown of what each light indicates: Red Light: This means that the battery is charging.

The red light will stay lit until the battery is fully charged, at which point it will turn green. Green Light: A green light means that the battery is fully charged and ready to use. Yellow Light: A yellow light indicates that there is a problem with the charger or the battery.

If you see a yellow light, be sure to check both the charger and the battery to make sure everything is in working order.

  • Why is My Battery Charger Blinking Yellow?

One of the most common questions we get here at Battery Chargers Plus is “Why is my charger blinking yellow?” While a number of things could be causing this, there are a few key reasons that are most likely culprits. Let’s take a closer look.

First, it’s important to understand that when you plug in your charger to an outlet, it actually goes through two different stages before it starts charging your battery. In the first stage, the charger is simply checking to see if there is power coming from the outlet and if everything is working correctly. This process usually only takes a second or two.

However, if the charger does not detect any power coming from the outlet, it will enter what’s called “fault mode.” fault mode essentially means that there is something wrong with either the charger or the outlet (or both).

When this happens, the charger will usually start blinking yellow (or sometimes red). There are a few different things that can cause your charger to enter fault mode and start blinking yellow.

One of the most common reasons is simply because the outlet isn’t working properly. This could be because it’s not getting any power from your home’s circuit breaker or because there’s something else going on with the wiring.

If you’re not sure whether or not your outlet is working properly, you can test it with a multimeter or by plugging in another device (like a lamp) to see if it turns on.

Another possibility is that there’s something wrong with the charging port on your device itself. Sometimes dirt or debris can build up in this port and prevent proper contact between your charger and your device. Try cleaning out this port with a cotton swab dipped in rubbing alcohol to see if that fixes the problem.

Finally, it’s also possible that there’s an issue with your actual battery charger itself. If you’ve been using it for a while, chances are good that it may simply be worn out and need to be replaced. Older chargers often don’t work as well as newer ones and may even damage your battery if used for too long.

If you think this might be the case, try borrowing a friend’s charger or buying a new one online to see if that solves the problem.

  • What Does It Mean When a Trickle Charger Blinks Green?

When a trickle charger blinks green, it means that the battery is almost fully charged. The blinking indicates that the charging process is almost complete and that the battery only needs a small amount of charge to be fully operational.

  • What Does Orange Light on Battery Tender Mean?

Assuming you are referring to a Battery Tender Plus charger, the orange light indicates that the battery is charging. The unit has an automatic shut-off feature, so when the battery reaches full charge, the charger will turn off and the light will turn from orange to green.


In conclusion, the Battery Tender Light Codes can be confusing and difficult to understand. It is important to know that a solid yellow light indicates the battery is fully charged while flashing yellow and green indicate that it’s still charging. 

A flashing red and green signal a need for troubleshooting, while an orange light means that the battery tender is not working properly. A rapidly flashing green means that the battery tender has detected a problem with the battery and needs to be checked immediately. 

Lastly, the lights on the Battery Tender Junior 800 are meant to identify how much power is stored in the battery and if it needs charging. By understanding these codes, you’ll have more control over your vehicle’s performance and save yourself time and money in the long run. All in all, it is important to know and understand the Battery Tender Light Codes for better battery

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