[flyboy1800]

I have several battery tenders over the years and I thought I knew how they work.
I now have only two battery tenders, one is a battery tender plus with a separate red light, and a separate green light, and another one is a battery tender Jr. with only one light that shows either red or green depending on what it is doing.
I know the following.
Red solid light - battery is being charged.
Blinking green light - battery is almost charged. (the battery tender plus does this)
Solid Green - Battery is charged.

The battery tender Jr, when I would plug it in would be solid red for a while and then turn solid green and stay that way.
Now after sitting on a battery overnight it will blink alternately Red and then Green, over and over for hours.
If I replace the battery tender Jr with the battery tender Plus, it goes to solid green in about 1 minute, telling me the battery is fully charged.
Could the the battery tender Jr be going bad?

 

[gripwing]

I have several battery tenders over the years and I thought I knew how they work.
I now have only two battery tenders, one is a battery tender plus with a separate red light, and a separate green light, and another one is a battery tender Jr. with only one light that shows either red or green depending on what it is doing.
I know the following.
Red solid light - battery is being charged.
Blinking green light - battery is almost charged. (the battery tender plus does this)
Solid Green - Battery is charged.

The battery tender Jr, when I would plug it in would be solid red for a while and then turn solid green and stay that way.
Now after sitting on a battery overnight it will blink alternately Red and then Green, over and over for hours.
If I replace the battery tender Jr with the battery tender Plus, it goes to solid green in about 1 minute, telling me the battery is fully charged.
Could the the battery tender Jr be going bad?

Take a look at this.

 

[flyboy1800]

Take a look at this.

Wow! Thanks, I noticed that blinking light as soon as I plug it in.
I am going to see if I can fix that. Worse comes to worse and I screw it up, I won't be any worse off.

 

[gripwing]

Go for it.
I was able to fix mine with that video.
Safe travels

 

[jettawreck]

The Battery Tender JR I have\had is defective and I no longer use it. It charges up to 12.5 volts and stops, shows "charged" indicator. Hook up any of the other 4 maintainer\tenders and they continue to charge longer before indicating a fully charged state.

 

[DDL]

Take a look at this.

I wish I would have know that when I threw away two older Jr's that died like that. I have a newer Jr. on my Tailwind and it has been going for years, longer than the older Jr's that died. My car and second bike has a bigger 4watt LA/LiFo switchable Battery Tender.

 

[Snowmoer]

I am not a Jr. fan. We used one at work to keep the battery charged on an emergency vehicle that sits a lot. It failed and the battery did not stay charged. Switched it over to a Tender Plus, no problems for the past 10 years. I have been using the Tender and Tender Plus for over 30 years. My original 30 year old tender is still going strong.

 

[tamathumper]

@klook used that video (or one like it) to repair a Deltran Battery Tender Jr.

 

[klook]

@klook used that video (or one like it) to repair a Deltran Battery Tender Jr.

And it still works.....