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Bike lamp, battery tech question

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il Offline pomsbz

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Bike lamp, battery tech question
on: July 15, 2019, 04:27:38 PM
Hi folks,

I'm not very electrical minded. I have this lamp (https://www.ebay.com/itm/263711644964) on my electric bike but it doesn't get used any more. If I wanted to fit it to my regular bike, could I power it with 18650 cells and if so how many would I need in tandem to get it to run? I don't mind less than full power, it's very bright already. It's a good light.

Thanks!
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spam Offline comis

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Re: Bike lamp, battery tech question
Reply #1 on: July 15, 2019, 05:31:34 PM
Quote from: pomsbz on July 15, 2019, 04:27:38 PM
Hi folks,

I'm not very electrical minded. I have this lamp (https://www.ebay.com/itm/263711644964) on my electric bike but it doesn't get used any more. If I wanted to fit it to my regular bike, could I power it with 18650 cells and if so how many would I need in tandem to get it to run? I don't mind less than full power, it's very bright already. It's a good light.

Thanks!

Pomsbz, the specification on the ebay page claim it operates from DC 12V-80V, how do you used to supply the power to this light from your electric bike or do you know how many volts is your electric bike supplying to the light?   Is your electric bike running on something like a car battery?

I think it may be possible to use 18650 to power this, but just want to make sure there is enough power and the current draw is not too high so the batteries get too warm too quickly.

Another way is simply to ask the seller whether this light can be run on 18650(protected?) and how many cells are needed.
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il Offline pomsbz

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Re: Bike lamp, battery tech question
Reply #2 on: July 15, 2019, 06:33:39 PM
Quote from: comis on July 15, 2019, 05:31:34 PM
Pomsbz, the specification on the ebay page claim it operates from DC 12V-80V, how do you used to supply the power to this light from your electric bike or do you know how many volts is your electric bike supplying to the light?   Is your electric bike running on something like a car battery?

I think it may be possible to use 18650 to power this, but just want to make sure there is enough power and the current draw is not too high so the batteries get too warm too quickly.

Another way is simply to ask the seller whether this light can be run on 18650(protected?) and how many cells are needed.

The bike battery is 48V (I think). To be honest I think I'm just going to stick with a flashlight. I bought this bracket https://www.ebay.com/113812182929 and I'll just stick one of my BLF A6 SE's on it.
"It is better to lose health like a spendthrift than to waste it like a miser." - Robert Louis Stevenson
Merit Badges Start a new thread and post a photo of a traditional folder for thirty (30) consecutive days. Join the brave and happy few, who choose a different path. Enter on the boulevard of broken dreams. Must post a step by step pictorial of a knife or multitool modification (scale swap not included) Must start new thread with photos of multitools (Magazine/Catalogue type photos) Start a new thread and post a picture of fire making kit or fire with a multitool Start a new thread with a photo of a modded knife or multitool with your EDC Start a new thread with photos of your titanium gear with a multitool or sak Start a new thread with a photo of custom or non standard SAK scales in your collection Start a new thread with photos of your carabiners in use Must start a thread with a photo of at least three (3) of your watches Must start a thread with a photo of your EDC watch Start a new thread and post a photo of a flashlight as part of your EDC Start a new thread with photos of camping, including those showing preferred camping equipment Start a new thread with photos of your zip ties in use Start a new thread showing photos of your outdoor cooking

spam Offline comis

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Re: Bike lamp, battery tech question
Reply #3 on: July 16, 2019, 09:36:57 PM
Quote from: pomsbz on July 15, 2019, 06:33:39 PM
The bike battery is 48V (I think). To be honest I think I'm just going to stick with a flashlight. I bought this bracket https://www.ebay.com/113812182929 and I'll just stick one of my BLF A6 SE's on it.

Wow, 48volts :o


That will be a lot of 18650 to match that voltage, and finding a good weather proof case and maintaining those batteries would probably be a hassle.  I agree with you--it probably is easier to find a flashlight with decent throw and good spill for bicycle use.
Merit Badges Participants shall carry and use one Soldier knife, the model of their choosing, for the duration of the 90 days and post a picture each day. Start a new thread and post a photo of an Executive or Director for thirty (30) consecutive days. In this challenge,  carry one(1) Pliers-based or Non-pliers multitool that we always have prejudice against, hate or even fear and post a picture everyday for 30 days Start a new thread and post a photo daily of any SAK 74mm or smaller ( you can switch it up daily ) for thirty (30) consecutive days. Participate in a Challenge thread and post a photo of a 'folding hunter' knife that isn't a Buck 110 for thirty (30) consecutive days. Participate in a challenge thread and post a photo of a Victorinox 91mm XAVT/XL/XLT, 111mm Workchamp XL, Wenger/Delemont S54/Tool Chest Plus or Wenger Giant for thirty (30) consecutive days Using EDC items randomly selected with a poker hand, post a photo of your EDC or a component of the EDC that got used during the course of the day for 4 weeks (or 30 consecutive days) Start a new thread and post a photo of the 111mm sak for thirty (30) consecutive days. Start a new thread and post a photo of the minimal sak (2 layers or fewer) for thirty (30) consecutive days. Participate and contribute in Challenge thread and post a photo of either an Axe, MT/Folding knife or Fixed blade (picked at the beginning of challenge) for thirty (30) consecutive days. Participate in a Challenge thread and post a photo of a Spyderco knife for thirty (30) consecutive days. Participate and contribute in Challenge thread and post a photo of a different blade each day for thirty (30) consecutive days. Participate  in Challenge thread and post a photo of a SAK Soldier for thirty (30) consecutive days. Participate in a challenge thread and post a photo of a SAK Cybertool (any variant), Swisschamp, Champion or Toolchest for thirty (30) consecutive days. Participate  in Challenge thread and post a photo of a Fieldmaster SAK for thirty (30) consecutive days. Start a new thread and post a photo of the discontinued sak/mt for thirty (30) consecutive days. Start a new thread and post a photo of a fixed blade for thirty (30) consecutive days. Participate  in Challenge thread and post a photo of a Explorer SAK for thirty (30) consecutive days. Start a new thread and post a photo of any gear for thirty (30) consecutive days during the MTo anniversary month. Start a new thread and post a photo of the leatherman (supertool, core, hacks) for thirty (30) consecutive days. Participate  in Challenge thread and post a photo of a Vic Spirit MT for sixty (60) consecutive days.

ie Offline Don Pablo

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Re: Bike lamp, battery tech question
Reply #4 on: July 17, 2019, 12:12:15 AM
For 48V, you would have to buy extra electronics to bump the voltage from a couple of 18650s to 48V (slightly complicated, inefficient and not free), or hook up 13 batteries.  :ahhh
A 18650 bike flashlight will definitely be cheaper.
(And more streamlined. :D )
Hooked, like everyone else. ;)

All hail the hook!
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il Offline pomsbz

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Re: Bike lamp, battery tech question
Reply #5 on: July 17, 2019, 03:28:07 PM
The light only needs 12V, not the full 48V of the bike battery. :)

I've been riding for the past couple of nights with just a flashlight and it's been more than fine actually!
"It is better to lose health like a spendthrift than to waste it like a miser." - Robert Louis Stevenson
Merit Badges Start a new thread and post a photo of a traditional folder for thirty (30) consecutive days. Join the brave and happy few, who choose a different path. Enter on the boulevard of broken dreams. Must post a step by step pictorial of a knife or multitool modification (scale swap not included) Must start new thread with photos of multitools (Magazine/Catalogue type photos) Start a new thread and post a picture of fire making kit or fire with a multitool Start a new thread with a photo of a modded knife or multitool with your EDC Start a new thread with photos of your titanium gear with a multitool or sak Start a new thread with a photo of custom or non standard SAK scales in your collection Start a new thread with photos of your carabiners in use Must start a thread with a photo of at least three (3) of your watches Must start a thread with a photo of your EDC watch Start a new thread and post a photo of a flashlight as part of your EDC Start a new thread with photos of camping, including those showing preferred camping equipment Start a new thread with photos of your zip ties in use Start a new thread showing photos of your outdoor cooking

spam Offline comis

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Re: Bike lamp, battery tech question
Reply #6 on: July 20, 2019, 02:53:02 PM
Quote from: pomsbz on July 17, 2019, 03:28:07 PM
The light only needs 12V, not the full 48V of the bike battery. :)

I've been riding for the past couple of nights with just a flashlight and it's been more than fine actually!

That's cool!  Should be pretty easy to maintain and less weight too!
Merit Badges Participants shall carry and use one Soldier knife, the model of their choosing, for the duration of the 90 days and post a picture each day. Start a new thread and post a photo of an Executive or Director for thirty (30) consecutive days. In this challenge,  carry one(1) Pliers-based or Non-pliers multitool that we always have prejudice against, hate or even fear and post a picture everyday for 30 days Start a new thread and post a photo daily of any SAK 74mm or smaller ( you can switch it up daily ) for thirty (30) consecutive days. Participate in a Challenge thread and post a photo of a 'folding hunter' knife that isn't a Buck 110 for thirty (30) consecutive days. Participate in a challenge thread and post a photo of a Victorinox 91mm XAVT/XL/XLT, 111mm Workchamp XL, Wenger/Delemont S54/Tool Chest Plus or Wenger Giant for thirty (30) consecutive days Using EDC items randomly selected with a poker hand, post a photo of your EDC or a component of the EDC that got used during the course of the day for 4 weeks (or 30 consecutive days) Start a new thread and post a photo of the 111mm sak for thirty (30) consecutive days. Start a new thread and post a photo of the minimal sak (2 layers or fewer) for thirty (30) consecutive days. Participate and contribute in Challenge thread and post a photo of either an Axe, MT/Folding knife or Fixed blade (picked at the beginning of challenge) for thirty (30) consecutive days. Participate in a Challenge thread and post a photo of a Spyderco knife for thirty (30) consecutive days. Participate and contribute in Challenge thread and post a photo of a different blade each day for thirty (30) consecutive days. Participate  in Challenge thread and post a photo of a SAK Soldier for thirty (30) consecutive days. Participate in a challenge thread and post a photo of a SAK Cybertool (any variant), Swisschamp, Champion or Toolchest for thirty (30) consecutive days. Participate  in Challenge thread and post a photo of a Fieldmaster SAK for thirty (30) consecutive days. Start a new thread and post a photo of the discontinued sak/mt for thirty (30) consecutive days. Start a new thread and post a photo of a fixed blade for thirty (30) consecutive days. Participate  in Challenge thread and post a photo of a Explorer SAK for thirty (30) consecutive days. Start a new thread and post a photo of any gear for thirty (30) consecutive days during the MTo anniversary month. Start a new thread and post a photo of the leatherman (supertool, core, hacks) for thirty (30) consecutive days. Participate  in Challenge thread and post a photo of a Vic Spirit MT for sixty (60) consecutive days.

fi Offline AlephZero

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Re: Bike lamp, battery tech question
Reply #7 on: August 15, 2019, 07:57:08 PM
I used to run with one of these (the big one in the pic) MTE G33



With the new ebike I chose this one, Fenix BC30R:





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