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Old 07-18-11, 11:02 AM   #1
americanlt2
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Running Out Of Batteries & My Tailight........

I'm wondering if there is any way to know when your batteries are finished working on a taillight ahead of time??? It seems kinda dangerous to me to have my taillight not working and not knowing it has stopped. Thanx
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Old 07-18-11, 11:04 AM   #2
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I always carry a small pack of batteries in my pack for my commute just for what you described.
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Old 07-18-11, 12:12 PM   #3
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i run rechargeables in my rear tail light. but yet im not UP TO DATE on my rides either...
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Old 07-18-11, 12:18 PM   #4
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Run two lights at the same time or:


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Old 07-18-11, 12:24 PM   #5
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I run rechargeables (hybrid NiMH), replace them every week of regular use, and carry a set of spares. And glance at the light every few miles.
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Old 07-18-11, 02:18 PM   #6
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Yep. Run two lights for redundancy if riding in poor light. Two are better than one, and if one fails, you still have the other.
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Old 07-18-11, 08:49 PM   #7
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So the light will get dimmer as the batteries are running out? I am just using regular batteries.
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Old 07-18-11, 09:03 PM   #8
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Originally Posted by americanlt2 View Post
So the light will get dimmer as the batteries are running out? I am just using regular batteries.
With most lights, yes. With some the cutoff is somewhat abrupt.
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Old 07-19-11, 02:41 PM   #9
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Virtually all modern LED blinkies have regulator circuits so the brightness stays constant until close to the end. When the battery is fresh, it takes very short sips off it. As the battery gets lower, the regulator takes longer drinks keeping the LED at the same brightness. These regulator circuits can interfere with non ANT wireless sensors.
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Old 07-19-11, 04:31 PM   #10
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Usually use a Planet Bike SF taillight. It's usually in blink mode while riding, but to turn it off you first have to push the button once to switch it to solid on and then again to off. When it's switched to solid and the batteries are weak it dims noticeably within the first second and that's my cue to change out the batteries or recharge them. At that point it'll still run ok for at least an hour in blink mode with decent brightness.
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Old 07-19-11, 06:57 PM   #11
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I worried about the same thing. But I have a very bright homemade light that is probably as bright as a Dinotte rear light. It is mounted on my "nighttime" bike, and that bike has a rear view mirror. I can see the light reflecting off the road in my mirror.
If I do run at night using commercial blinkies I always use two in case one fails, and I look back from time to time to check them <---- good stretching exercise for the back.
If you look closely you can often see your blinkie reflecting off of some part of your bike. This works for me if I'm somewhere with no ambient lighting. It probably won't work in the city.
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Old 07-20-11, 12:25 AM   #12
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Virtually all modern LED blinkies have regulator circuits so the brightness stays constant until close to the end.
Heres a few common rear blinkies that are unregulated.
Cateye LD1100 LD600
Mars 2.0 4.0
PBSF

The new cateye rapid is the only one I have that is regulated.
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Old 07-20-11, 08:18 AM   #13
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So the light will get dimmer as the batteries are running out? I am just using regular batteries.
yep. I see a LOT of folks with weak blinkies attached at odd angles and it's less effective than standard pedal reflectors. If you ride often at night(4hrs/wk) get a PB superflash or equivalent and a set of 4 AAA rechargables that you change out every week or two. If you ride infrequently at night spend the big bucks for lithium AAA and they'll hold a charge for a long time between uses.

I have a pair of AAA lithiums as back up in my spare tire bag if the rechargables are dead. You can cut off a finger of a nytril glove and fit the spare batteries in it.

Last edited by LeeG; 07-20-11 at 08:22 AM.
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Old 07-20-11, 12:35 PM   #14
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I'm wondering if there is any way to know when your batteries are finished working on a taillight ahead of time??? It seems kinda dangerous to me to have my taillight not working and not knowing it has stopped. Thanx
really - the "right thing" to do is to use two tail lights- no matter what. Your life and well being are far more important than the expense.

And don't forget -just getting "bumped" at night could change your life -you don't have to get whacked.

If you want to get "anal" and really know what you are doing -then get a charger that displays the voltage of your batteries as they charge. (about $35 US with four AA batteries and four AAA to boot.)

The next thing would be a cheap multi-meter - anytime you have an Alkaline battery -AAA AA C D etc - and it reads less than 1.5V without a load - it is more than half way shot. They should read at least 1.5V if in good charge.

In any case - this thread is ridiculous in the sense that anyone will risk their life around saving a perhaps a "dollar per night" just to scrimp on batteries. Figure it out - playing the "save the battery game" is just a lot of non-sense when it comes to bicycle lighting.

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been there -saw the light -got real
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Old 07-20-11, 12:39 PM   #15
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Hey you got to check this guy out - not for taillights--
great web page
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