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Hello - my battery tender has operated perfectly throughout the year, but then today I noticed it was not green anymore; it went back to red! I checked and it was very warm (I guess full charging again) so I unplugged it from the bike and the wall.

The bike started fine. But:

Did my tender go bad?

Did I do something wrong, e.g. when I go for a ride can I just detach the quick connect and jump on and ride away or am I supposed to remove the tender from the wall outlet first?

Thank you, all.
 

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..have a vulcan good day!
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Hello - my battery tender has operated perfectly throughout the year, but then today I noticed it was not green anymore; it went back to red! I checked and it was very warm (I guess full charging again) so I unplugged it from the bike and the wall.

The bike started fine. But:

Did my tender go bad?

Did I do something wrong, e.g. when I go for a ride can I just detach the quick connect and jump on and ride away or am I supposed to remove the tender from the wall outlet first?

Thank you, all.
My Battery Tender Sr (not Jr ... LOL) blinks Red when connected to any battery.
D*** rain (during use) !
I'll open it up....probly a burnt Diode.

:smiley_th
 

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Discussion Starter #3

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... when I go for a ride can I just detach the quick connect and jump on and ride away or am I supposed to remove the tender from the wall outlet first?
I would always unplug from the wall regardless. Those power packs use electricity any time they are plugged into the outlet. Chargers for cell phones, cordless phones, cordless tools, etc., power packs for printers, speakers, etc., all use power whether connected to a device or not.

By leaving one plugged in 24/7, in theory you could use the device only once in a year, but still use up the life of the power pack. I unplug just to keep the electric bill down.
 

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I have 6 Battery Tender Jr.s I have noticed a couple of times over the past couple of years where one would not turn green while connected to a certain battery, even if it was new. Yet when I connected it to another battery, it worked fine. I believe your issue is with the battery rather than the tender.

The Deltran Battery Tenders are protected from both being connected to a dead short or an open circuit. It's very possible that leaving one plugged in for a long tome while not connected to a battery might eventually wear it out, but I usually just unplug the bike, let the light flash red, and plug the bike back in when I get back. I've been doing this about 5 years now, ever since I got the things.
 

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You should always unplug the charger before unplugging the battery and plug the battery up before the charger. The little battery tender is constantly checking the voltage of the battery to know how much amps it needs the supply. Powered charger with a disconnected battery, the charger is confused and will eventually burn the circuit board.
 

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You should always unplug the charger before unplugging the battery and plug the battery up before the charger. The little battery tender is constantly checking the voltage of the battery to know how much amps it needs the supply. Powered charger with a disconnected battery, the charger is confused and will eventually burn the circuit board.
There seems to be some controversy about this issue. I just sent an inquiry to Deltran about it, Hopefully I can get a straight answer. I have 6 bikes, all connected to Battery Tender Jr.s, and the charger itself is a bit difficult to get to on some of them. If it does need to be unplugged just while riding the bikes, I will probably connect them all to a switched power source, and turn them all off when I disconnect one from a bike.
 

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When mine stopped working you could really smell that something was burnt out once I opened it up.

However, once I opened it up, I don't see how I could have closed it again without using a lot of super glue. Just doesn't seem to be made to be opened up and closed again. Mine was a Battery Tender Jr. too.

I didn't run it 24/7, by the way, only when my bike sat for a loooong time (a month or more), I'd plug it in until the green light came on and then I stored the tender. Still burnt out after about a year and a half after I bought it. However, it MIGHT have been because of the outlet I plugged it into. I've never trusted that outlet.
 

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I just received this email back from Deltran as a response to my inquiry.

"The only problem with leaving the unit plugged into AC power with nothing attached would be that anything from AC power could affect the unit. As for a red flashing light, that means it is not seeing the battery and it is not putting out any kind of charge. Thank you and have a great day!

Pamela Williamson
801 International Speedway Blvd
DeLand, Fl 32724
386-736-7900
386-736-6458"

It does not make much sense to me. What does she mean by "anything from A/C power could affect the unit"? Could that not also happen with it connected to a battery?

As for the red flashing, she says that it is "not seeing the battery, and not putting out any charge" which basically means it is not doing anything if the light continues to flash red, which one of mine is doing. The battery is nearly new, and starts the bike fine. I'm going to switch that tender with one from another bike that does show green, to see if it is the tender or the bike.
 

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What she means is that your battery tender will be exposed to power spikes even when it's not charging a battery. Yes, it can also happen when it's charging a battery, she probably just means that it's being unnecessarily exposed longer to that risk.
 

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Ok, in my case anyway, it turned out to be the battery. I took the tender that was flashing red off my XT225, and swapped it with one from one of my scooters that was showing green. Same thing happened. The one from the scooter that did show green on the scooter flashed red on the XT225, and the one from the XT225 that had been flashing red showed green when connected to the scooter. The XT225 has a fairly new battery, but I needed one in a hurry, so I got one from Batteries Plus, rather than my usual WestCo. I'm going to take it back to them and get it checked, and explain about the battery tender problem. The battery is an AGM type. Anybody ever heard of batteries that a battery tender will not work with? These things are 5 years old, and came out long before that. There have been some changes in battery technology since then.
 

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Yes, it's definitely possible that the battery could be the problem. I think the same thing happened with the wet-cell that came in my bike. I didn't have a problem with my walmart AGM until my tender just burnt out one day.
 

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Why not put a meter on the battery and measure the volts whilst turning on the charger ?
If no increase in volts measure the current flow from the charger. If no current flow then nothing is coming out of the charger. In that case check first the output leads for any places where it may have got trapped, or bent and broken the wires inside the cable, look closely at any connections for corrosion or looseness. It may rescue a charger from the scrap heap.
 

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The charger (tender) that was flashing red. I put it on another battery, and it changed to green. The one that had been green on that battery started flashing red when I put it on the other battery. So it was the battery. The email I got from Deltran said that flashing red meant the charger did not know it was hooked up to a battery. If the battery were dead or close to it, it would show solid red, it it were almost charged it would flash green, and when fully charged, it would be solid green.

What I don't understand is how the battery tender can't tell it is hooked up to a battery. The fuse is good, the connections are good, the battery starts the bike just fine, yet the battery tender does not know it is connected?

There is a fundamental difference between a "charger" and a "tender" I have a 6 amp charger for car batteries, a 1 amp charger for motorcycle batteries, and several "tenders", one for each one of my motorcycle batteries. A tender will not charge a dead or very low battery. It does not put out enough current. A tender is designed to be left connected to the battery all the time. It monitors the condition of the battery voltage, and when it drops just a tiny bit, it sends just a few milliamps to the battery to keep it at full charge. It is a "maintainer" rather than a charger.

You can get chargers that are also maintainers, they will charge the battery until it is fully charged, then go into maintenance mode, keeping them topped off without overcharging them. I didn't figure I needed anything like that, since I keep my batteries connected all the time, and already have a charger.

But anyway, for some reason, Deltran Battery Tenders will not always know they are connected to a battery, even though that battery works fine. I don't have an explanation. When that happens, they flash red, just like they do when unplugged from the battery, and do not put out any current at all. I guess I will have to connect a regular 1 amp charger to that battery, connect it to a timer, and charge the battery a couple hours a day. The thing with that is, will the charger drain the battery when turned off?
 

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What she means is that your battery tender will be exposed to power spikes even when it's not charging a battery. Yes, it can also happen when it's charging a battery, she probably just means that it's being unnecessarily exposed longer to that risk.
x2
:smiley_th
 

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I would guess that the charger "knows" it is connected to a battery by reading the volt drop or current flow when connected. If a battery does not draw enough to cause a voltage drop, due to a high internal resistance, the charger will not recognize it is connected. Maybe?
 

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Discussion Starter #18 (Edited)
Thank you for the responses everyone - All the comments look great! Batteries is kind of a sore spot for me so I've taken all the comments seriously. Time to work on it, now! Thanks again be safe!
 

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When that happens, they flash red, just like they do when unplugged from the battery,
Mine went from solid green to solid red. Not flashing. Weird. I'm off to go try a few things. Thanks for your input and for asking Deltran!
 

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Hello - my battery tender has operated perfectly throughout the year, but then today I noticed it was not green anymore; it went back to red! I checked and it was very warm (I guess full charging again) so I unplugged it from the bike and the wall.

The bike started fine. But:

Did my tender go bad?

Did I do something wrong, e.g. when I go for a ride can I just detach the quick connect and jump on and ride away or am I supposed to remove the tender from the wall outlet first?

Thank you, all.
Solid red means it's trying to charge the battery. Since flashing green means it has over 80% charge, the solid red means it has less than 80% charge.

Sometimes the bike will start with a battery that isn't 100% charged. Especially if it's an AGM battery.

Do you have a voltmeter to measure the battery voltage? You can also measure the output of the tender when it's hooked up to the battery to see if it's really trying to charge it.
 
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