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Taillights won't work with new batteries

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Taillights won't work with new batteries

Old 10-11-21, 03:53 PM
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Gonzo Bob
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Taillights won't work with new batteries

I have a few old LED taillights that use 2 LR1 N-type 1.5V alkaline batteries - two SigmaSport RL 200s and two Cateye TL-LD550s. I like to use the SigmaSports because of the flexibility of attachment. The batteries in one recently died so I got some new ones but when I put them in, the light would not work. I tried them in the other SigmaSport and the LED flashed when I first inserted them but then went off and the switch would not turn it back on. It would repeatedly do this when I would take the batteries out and put them back in. So I tried the new batteries in one of the Cateyes and it worked fine. So I compared to the other Cateye which is working fine but the batteries are not brand new. The Cateye with the new batteries was noticeably brighter.

I don't have a voltmeter but I suspect the voltage on the new batteries is too high. The original batteries I had in the SigmaSport were Duracell and made in Belgium. The new ones are Duracell made in China. The "old" Cateye batteries are Energizer made in USA.

I guess I'll put the Energizers in the SigmaSport and the new Duracell in the Cateye and make sure to not get Duracell when I need new batteries for the SigmaSports.
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Old 10-11-21, 04:23 PM
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Try new batteries in your lights. I've purchased 'brand new' batteries in the past from online sellers that were well beyond their 'best used by' date (they were just about dead from the packaging.)
It's highly doubtful that you have some 1.5v batteries that have the incorrect, too high voltage.
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Old 10-11-21, 04:26 PM
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Get the Battery Daddy! I love mine... Comes with a tester also.
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Old 10-11-21, 04:29 PM
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Originally Posted by Bald Paul View Post
Try new batteries in your lights. I've purchased 'brand new' batteries in the past from online sellers that were well beyond their 'best used by' date (they were just about dead from the packaging.)
It's highly doubtful that you have some 1.5v batteries that have the incorrect, too high voltage.
The batteries I tried are brand new and are from a brick-and-mortar, not online. They work in the Cateyes but not in the SigmaSports. They are not dead.
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Old 10-11-21, 04:49 PM
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One way to test your hypothesis would be to put in one old and one new battery, so the total voltage is somewhere in the "normal" range for the light.
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Old 10-11-21, 06:15 PM
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Originally Posted by ThermionicScott View Post
One way to test your hypothesis would be to put in one old and one new battery, so the total voltage is somewhere in the "normal" range for the light.
Good suggestion!
  1. The SigmaSport lights work with an old Duracell and a new Duracell, but only when the new Duracell is in the upper position. They are really dim because the old Duracell are dead.
  2. They also work with a "newish" Energizer and a new Duracell, but again, only when the new Duracell is in the upper position. The lights are normal brightness with this combo.
  3. Here's another weird thing I stumbled on as I was trying two new Duracells again. I was putting the lower position battery in but hadn't fully seated it and the negative end was barely touching the spring clip (high resistive connection). The SigmaSport worked! And it was super bright! Now I am convinced the voltage is too high. I would bet a nickel on it
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Old 10-12-21, 04:44 AM
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I am not familiar with your lights, but when you cite the upper or lower position, perhaps the end of the battery has a shape that prevents it from touching a contact.

If the contact in the light is springy metal, can you bend that a bit so it contacts the battery?

I have a couple flashlights that can't use some batteries because the batteries are slightly larger in diameter than the tube in the flashlight they are supposed to fit into. Sometimes manufacturers don't quite conform to the industry standards for physical size and shape.
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Old 10-12-21, 08:10 AM
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I can't imagine not owning a basic voltmeter. Even the cheapest ones are accurate enough for measuring the voltage on a battery so you can decide if it needs replacing. It is great for troubleshooting.

Harbor Freight Tool used to give one away as a loss leader to get you in the store. My only complaint is it runs on a 9V battery (included) when one that uses regular AA or AAA batteries would be nicer. The current price is just $7. https://www.harborfreight.com/electr...ter-63759.html
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