I have a question for those that have a CTEK 3300 battery tender. I have the CTEK hooked up to my battery as per the instructions. The battery tender starts charging and displays a solid red light. Eventually, the battery tender charges the battery and displays a solid green light. At this point both red and greed lights are solid. The battery is now topped off.

Here's where it gets puzzling. Both red and green lights remain solid then after a few days a red light starts flashing with both green and red lights still solid. The CTEK battery tender is new. It replaced the other new one I bought. So that isn't the problem. The car has no issues with codes and starts up every time. The battery is only a few years old. So, I'm baffled.

Does anyone have an idea what's happening? Thanks in advance.

 

When you remove the charger and let the car sit for maybe an hour , what is the battery voltage. Also after a drive check the battery voltage . I don't have the 3300 but someone who does should chime in here.

 

 

I have the instruction manual but there is no mention of this flashing light issue. Since the battery is exactly two years old and I have no problem starting the car and no codes are thrown I wonder if the the battery is desulfating?

 

Why not drop them a line & ask?

​https://www.ctek.com/contactus​​​​​​

 

I did and CTEK sent a new battery tender. So, it isn't the battery tender. I'll get the battery voltage tested but I don't think that's the issue. I re-post when I find out.

 

Perhaps you should have included this insightful information in your original post?

It also may be worthwhile sharing at this point what battery you have 017, 019 or AGM, personally, whilst your CTEK 3300 is a great product, ours is a BIG heavy car when t comes to electrical usage and it may be better having a better charger such as the MXS 5.0 or better. I use my smaller CTEK on my smaller cars.

 

I think you're spot on with the battery tender. I think I'll buy a heavier duty one and see what happens. Thanks.

 

The Ctek 3300 is a 3.3 amp battery maintainer. The upgraded 4.3 is a 4.3 amp battery maintainer and the 5.0 is (you guessed it) a 5.0 amp battery maintainer. Their design is a slow low power charger that measures battery capacity and maintains it's state of charge. It is not meant to "charge " a battery. If you want a battery charger then go out and get one that can charge 10 amps or more. These are chargers and will fully charge a battery over a short period of time. They should not be left on after the battery reaches full charge. That is when you use a Ctek.

 

Thanks for the info. I don't think the battery needs charging, just topping off with a battery tender. I also think the flashing light on my CTEK 3300 could mean that, as mentionmed in an earlier post, the battery in my car is in need of habitual topping off. Hence, the flashing red light when the green light is still solid. That's just my guess. Perhaps my car's battery is just a power hungry critter.

 

How much do you drive the car? If driven enough, you shouldn't need a maintainer.

 

 

SLazz,

What's in your garage? Your Public Profile shows that you sold your 2006 XK8 and lists no other vehicles, and you don't have a signature with your ride(s). Do you have an X150?

 

Thanks for the info but this isn't the case w/ my CTEK. Both the RED and the GREEN lights remain solid while after an hour or so a third RED light joins in and flashes. I think my battery is weird. Perhaps it's discharging something. So, I keep the CTEK on until the one light starts flashing RED then I just unplug the mother. My car shows no signs of a problem and throws no codes.

 

Hi,

I have a 2007 XK 4.2 N/A. It's a nice cruiser but I think I'll be trading up within the year to a 2010 or newer XKR. (I'll update my profile now.)