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Old 11-29-14, 12:23 AM   #1
MAK
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How long is charge retained?

I'm looking at some hi quality (NightRider, Cygolite, Lezene, etc...) front lights and all are USB charged. I do a few week long rides and don't usually use the light every day and may not have access to electric at times.

Once a 500 or 700 lumen light is charged, how many days does it retain the charge? For example, after four days is it still at 90%, 80%, etc...?

Thank you.
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Old 11-29-14, 02:58 AM   #2
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For a lithium ion battery the self discharge is quite low, around 2% a month at normal temperatures. Some lights will consume significantly more than that when in standby and some less... so its a good idea to unplug the battery on these if possible. Check the manufactures specs on parasitic drain.
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Old 11-30-14, 01:44 PM   #3
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You could get a battery pack to bring with you also. A 10k ma could recharge a light multiple times and give added security
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Old 12-02-14, 08:19 PM   #4
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Quote:
Originally Posted by MAK View Post
I'm looking at some hi quality (NightRider, Cygolite, Lezene, etc...) front lights and all are USB charged. I do a few week long rides and don't usually use the light every day and may not have access to electric at times.

Once a 500 or 700 lumen light is charged, how many days does it retain the charge? For example, after four days is it still at 90%, 80%, etc...?

Thank you.

They usually have different settings and the run time will depend on what setting you use for your ride. Scroll down page for lumina 750 run times

NiteRiderLumina 750 - NiteRider
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Old 12-02-14, 11:24 PM   #5
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For what it is worth, I have this light

Amazon.com : Rechargeable 1200 Lumen Bicycle Light - Headlight - Flashlight - 5 Easy Bike Light Modes - Highest Quality - WATERPROOF- Improves Safety, Day and Night - FREE TAILLIGHT : Bike Headlights : Sports & Outdoors

On the low setting (I think 350) it lasted 24 hours and the battery sat after being fully charged for a week before running it.

the 650 lm mode lasted about 16 if i remember right.
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Old 12-03-14, 09:28 AM   #6
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Given the answers above, this may be redundant:

Don't worry about self-discharge on a week long trip.

Do worry about running the lights enough to discharge them.

FWIW, you can probably recharge lights in small towns. Relax in a library for a few mid-day hours, or eat in a diner or small town restaurant. Look for a table near an outlet.
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